The narrative of the 2020 Democratic primary shifted following a strong performance by Sen. Kamala Harris (D-Calif.) in the first debate in June. But two months later, a new poll puts us roughly back where we started.

While Harris experienced a major polling bump following her break-out first debate, during which she confronted former Vice President Joe Biden on busing, she's been slipping ever since the second debate in July. In the latest poll from CNN and SSRS released on Tuesday, she's down to 5 percent support, a 12-point drop from a post-debate June poll that had her at 17 percent support.

This poll brings Harris down to 10 points behind Sen. Bernie Sanders (I-Vt.) and 9 points behind Sen. Elizabeth Warren (D-Mass.), as well as 24 points behind Biden; she had been just five points away from the former vice president in June. CNN notes that this 5 percent support for Harris is about where she was before the first presidential debate.

Biden went up seven points in the CNN/SSRS poll compared to the one conducted in June, putting him at 29 percentage points, 14 points ahead of his closest rival, Sanders.

After a performance in the second Democratic debate that clearly did not make as much of an impression on voters as her first, Harris will next have a chance during the third debate in September, which will now have at least 10 candidates. With this CNN poll, former Secretary of Housing and Urban Development Julián Castro has met the qualification requirements. Should just one more candidate qualify, the debate will be split into two nights again, meaning Harris may or may not get another rematch with Biden.

CNN's poll was conducted by speaking to 1,001 adults nationally over the phone from Aug. 15-18. The margin of error is 6.1 percentage points. Read the full results at CNN. Brendan Morrow

Rep. Adam Schiff (D-Calif.), the chair of the House Intelligence Committee, seemed to have one foot on the impeachment trail Sunday during an appearance on CNN's State of the Union.

Schiff told host Jake Tapper that, although he's been reluctant to support impeachment measures against President Trump, the latest news out of the Oval Office might be changing his mind. Schiff said that if Trump did actually threaten to withhold military aid from Ukraine and repeatedly push Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden's son, Hunter Biden, then there might not be any other way around it. "We may very well have crossed the Rubicon," he said.

Schiff contends that the allegations represent "the most profound violation of the presidential oath" and that no privilege can cover corruption. As to whether it's true or not, Schiff argued that the president could just release the transcript of his call with Zelensky if there was nothing unsavory about it. "Clearly, he's afraid for the public to see," Schiff told Tapper. In other words, something stinks. The Week Staff

Iran's leaders already gave their two cents on the rising tensions between Tehran and the United States on Sunday. Tuns out, some folks in Washington who have had some experience dealing with Iran also had some things to say.

Secretary of State Mike Pompeo, appearing on CBS' Face the Nation, once again accused Iran of orchestrating the strikes against Saudi oil facilities last week, while repeating that he considers it "a state-on-state act of war." When host Margaret Brennan mentioned that Iranian Foreign Minister Mohammad Javad Zarif denies the allegations, Pompeo was not overly friendly to his counterpart, saying "it's beneath the dignity of anyone to listen to" him. But Pompeo did maintain he's looking for a diplomatic solution.

Former Secretary of State John Kerry and former Defense Secretary James Mattis shared some sentiments with Pompeo. In an appearance on ABC's This Week, Mattis said Tehran is doing what it's always done — "trying to craft a foreign policy that pushes others around." Mattis added that the U.S. needs to urge its allies to stand with Washington to prevent Tehran from destabilizing the Middle East.

Kerry, who helped foster the 2015 nuclear pact with Iran, also appeared on Face the Nation where he preached restraint when it came to dealing with Tehran and even praised President Trump for doing just that. But he did say that he thinks Iran was "one way or the other" behind the oil facilities attacks and that "our allies" who still support the 2015 agreement also "support holding Iran accountable for other issues in the region." Tim O'Donnell

Antonio Brown continues to dominate NFL headlines, but the rest of the league will attempt to take back the spotlight for Sunday's slate of games. Here are four Week 3 matchups to watch.

Baltimore Ravens vs. Kansas City Chiefs, 1 p.m. E.T. on CBS — Pencil these two teams in for appointment viewing most weeks. Reigning MVP Patrick Mahomes will lead Kansas City from under center against fellow quarterback Lamar Jackson and the surging Ravens. It's probably safe to expect some lofty numbers from both of them. Indeed, Ravens defense coordinator Don Martindale said Jackson-Mahomes could become the next iteration of the Tom Brady-Peyton Manning rivalry that defined the NFL for over a decade.

Pittsburgh Steelers vs. San Francisco 49ers, 4:25 p.m. E.T. on CBS — Pittsburgh has had a rough start to the season, including losing longtime quarterback Ben Roethlisberger to a season-ending elbow injury. But it will be interesting to see whether second-year quarterback Mason Rudolph can step into that role and get the team back in contention. San Francisco, meanwhile, has rolled to victory in its first two games and will look to improve to 3-0.

New Orleans Saints vs. Seattle Seahawks, 4:25 p.m. E.T. on CBS — New Orleans will also be without their longtime quarterback Drew Brees, but they have a proven veteran in Teddy Bridgewater to fill the gap. Bridgewater and the Saints' talented roster should be good enough to stay in contention, but Seattle, who remains undefeated behind stellar play from quarterback Russell Wilson, will be a tough matchup, especially on the road.

Los Angeles Rams vs. Cleveland Browns, 8:20 p.m. on NBC — The Browns laid an egg in their opener against the Tennessee Titans, despite high expectations for the long-suffering franchise. They bounced back with a win Monday over the New York Jets, who were down to their third-string quarterback by the end of the game. The dynamic Rams will be a much better barometer for determining whether the Browns are just hype. Tim O'Donnell

The World Health Organization in a statement Saturday accused Tanzania of withholding information about suspected Ebola cases in the country.

The U.N. agency was made aware of the suspected cases in Tanzania earlier this month, but WHO was then prevented from participating in blood samples testing. The Tanzania government then reportedly informed the organization that Ebola had been ruled out, although they did not offer any alternative diagnoses.

WHO's statement referred to a 34-year-old doctor studying in central Uganda who returned to Tanzania with Ebola-like symptoms before dying in Dar es Salaam, the country's capital, earlier in September. The illness was reportedly contagious and numerous contacts became ill. Unofficial reports led WHO to believe that the woman had, in fact, tested positive for Ebola.

Tanzania has never reported a case of Ebola, The Washington Post reports, noting that tourism is a major driver in the nation's economy, so fears that the presence of the disease could lead to trip cancellations may exist.

U.S. Health and Human Services Secretary Alex Azar has previously urged Tanzania to "comply with its obligation under the International Health Regulations" and allow for independent verification of the circumstances surrounding the doctor's death. The current Ebola outbreak began in August 2018. While new cases have occurred rapidly, they have mostly remained confined to provinces in eastern Congo. Read more at The Washington Post. Tim O'Donnell

Iranian Foreign Minister Mohammad Javad Zarif said Iran does not plan on starting a war, but they will finish one if a conflict should eventually happen.

In an interview airing on Sunday's edition of CBS' Face the Nation, host Margaret Brennan asked Zarif if he was "confident" that Iran could avoid a war. Zarif was pretty forthright in his response, simply responding "no." He did add that he is confident Tehran will not start a conflict, however. But he said "whoever starts one will not be the one who finishes it." When Brennan asked him to clarify, Zarif said that he means if a war does break out it will not be a "limited" one.

Zarif also criticized the United States' decision to send more troops to the Gulf region in a speech, describing it as "posturing." Meanwhile, Iranian President Hassan Rouhi had some harsh words Sunday for the U.S., as well, calling the decision a "disaster" and urging foreign forces to stay out of the region. "If they're sincere, then they should not make our region the site of an arms race," he said during a speech. "The farther you keep yourselves from our region and our nations, the more security there will be."

In the same speech, he did say that Iran would present a peace initiative at the United Nations General Assembly in New York on Tuesday, though he gave few details. Tim O'Donnell

There's been a changing of the guard in Iowa — for now, at least.

Sen. Elizabeth Warren (D-Mass.) passed former Vice President Joe Biden for the lead in the Democratic presidential primaries in a new Des Moines Register/CNN/Mediacom poll of likely Iowa caucusgoers, which was released Saturday. Warren picked up 22 percent in the poll, which gives her a two-point edge over Biden. Further, 71 percent of those polled said they're at least considering Warren, the highest mark among the candidates.

Sen. Bernie Sanders (I-Vt.) trailed Warren and Biden with 11 percent, and no other candidate reached double digits, though South Bend, Indiana, Mayor Pete Buttigieg was close at nine percent. "This is the first major shakeup," said J. Ann Selzer, president of Selzer & Co., which conducted the poll. "It's the first time we've had someone other than Joe Biden at the top of the leader board." Only one in five likely caucusgoers said their minds were made up, however.

Warren has been rising steadily in Iowa for some time. In December 2018, she was only at eight percent in the same poll. That increased slightly to nine percent in March, and then 15 percent in June. The most recent poll was conducted between Sept. 14-18 and surveyed 602 likely Democratic caucusgoers. The margin of error was four percentage points. Read more at The Des Moines Register and CNN. Tim O'Donnell