President Trump's 25 percent tariff on imported steel and 10 percent levy on aluminum went into force for Mexico, Canada, and the European Union at midnight on Friday, and all three key U.S. allies quickly vowed to retaliate. The specter of a trade war sent U.S. markets reeling, with the Dow closing down 252 points, or 1 percent, on Thursday. The EU has promised to target imports of U.S. products like Kentucky bourbon, motorcycles, and blue jeans, while Mexico said it will slap tariffs on U.S. pork, grapes, cheeses, apples, and flat steel. Canada, which provides most of America's imported steel and aluminum, said it will hit the U.S. with tariffs on $12.8 billion worth of steel, toilet paper, and other goods.

Early Friday, Germany's economy minister said the EU might coordinate its response with Canada and Mexico. French President Emmanuel Macron called Trump's tariffs "illegal" and warned that as the world learned in the 1930s, "economic nationalism leads to war." Canadian Prime Minister Justin Trudeau said "these tariffs are totally unacceptable" and criticized Trump's national security justification for imposing them. "That Canada could be considered a national security threat to the United States is inconceivable," he said.

"There will be a lot of focus in the weeks ahead on the direct, first-round effects of the steel and aluminum tariffs" in the U.S., including higher prices for certain products and some businesses that "shutter entirely," writes Neil Irwin at The New York Times. But the "longer-term danger for the American economy" is that Trump's "trade policy is displaying an erratic, improvised, us-against-the-world quality." In a market economy, "businesses can thrive despite bad policies," as long as they are stable, he adds. "That stability is part of what differentiates rich countries from poor ones," and the big cost of Trump's policies is "the risk that the United States is not as stable and reliable a place to do business as you once thought." Peter Weber

Harris Wofford, a lifelong Democrat who worked alongside the leaders of the party, died Monday. He was 92, and died in Washington, D.C. after suffering a fall on Saturday, The Washington Post reports.

Wofford served in World War II, and soon went on to a life of civil rights activism. He was "one of the first white students to graduate from the historically black Howard University Law School," the Post writes, and later marched with Martin Luther King Jr. in Selma, Alabama. He worked on former President John F. Kennedy's campaign, compelling him to meet with King. That move was credited with pushing black voters to overwhelmingly elect Kennedy, per Philly.com.

Wofford spent years as Kennedy's special assistant for civil rights, then left to help found the Peace Corps. He was president of Bryn Mawr College for eight years, chaired Pennsylvania's Democratic Party, and went on to serve in former Pennsylvania Gov. Bob Casey Sr.'s cabinet. Casey appointed Wofford to the Senate to replace Republican Sen. John Heinz (Pa.), who was killed in an airplane accident in 1991.

In 2008, Wofford introduced then-Sen. Barack Obama before a noteworthy speech on race. And in 2016, he revealed he'd married Matthew Charlton, a man 50 years younger than his 90. Read more about Wofford's life at The Washington Post. Kathryn Krawczyk

Sen. Mark Warner (D-Va.) has one word for America's longest running shutdown: stupidity.

The unprecedented shutdown fell into its 32nd day over President Trump's demand for border wall funding and Democrats' refusal to give in. But while there remained no hint of a deal to reopen the government on Tuesday, Warner did introduce the STUPIDITY Act to prevent hypothetical shutdowns in the future.

Under the craftily acronymed act, the federal government would keep running even if legislators and the president fail to agree to a new funding bill by a shutdown deadline. It would simply preserve the previous fiscal year's funding levels but adjust them for inflation. It wouldn't fund the legislative and executive branches, though, "effectively forcing Congress and the White House to come to the negotiating table" without hurting American jobs, Warner's press release says. And if you're wondering what STUPIDITY means, well...

Of course, STUPIDITY does neglect to include a "C" to account for "coming." But STUPIDITCY would just be, well, stupid. Kathryn Krawczyk

Anonymous FBI agents say the partial government shutdown is preventing them from effectively doing their jobs and impeding some ongoing investigations.

In a report released by the FBI Agents Association Tuesday, unnamed agents speak about how lack of funding due to the shutdown has hindered their work. One agent said the shutdown has "eliminated any ability to operate" and that "the fear is our enemies know they can run freely," while another said they can't "protect and serve the American people" unless the government is "re-opened immediately," Politico reports

Due to issues with funding, some interviews, indictments, and grand jury subpoenas have been delayed, the report details. The report says that the FBI's agents, currently working without pay, are operating with "increasingly limited resources" and that "this situation is not sustainable."

The president of the FBI Agents Association, Tom O'Connor, shared a similar perspective upon the release of the report. "The failure to fund the FBI is making it more difficult for us to do our jobs," he said, per CBS News, "to protect the people of our country from criminals and terrorists."

There is currently no end in sight to the partial government shutdown, which has entered its 32nd day. President Trump is continuing to insist on $5.7 billion in border wall funding, a request that Democrats have consistently refused, and he signaled on Twitter Tuesday he's not backing down, writing, "No cave!" Brendan Morrow

Americans' attitudes toward climate change have changed quite dramatically in just a few years, with almost half now seeing it as an immediate threat.

In a poll released Tuesday, 48 percent of Americans said that people in the U.S. are being harmed by climate change "right now," Axios reports. This is an increase of 16 percentage points since that question was asked in March 2015, and an increase of nine points since it was asked in March 2018. Going back even further, in January 2010, only 24 percent of Americans said climate change was currently causing harm.

Americans, according to this poll, no longer simply see climate change as a problem that their kids or their grandkids will have to deal with. Instead, 49 percent said they believe they will be personally harmed by it. Additionally, 72 percent of Americans said climate change is an important issue for them, up from 63 percent last year and 55 percent in 2013. And 69 percent said they're very or somewhat worried about it, up from 52 percent in March 2015.

Overall, 73 percent said that climate change is occurring, compared to 57 percent in 2010, while just 14 percent said it's not occurring. This shift in attitude correspondents with Americans growing more informed on the issue, as 57 percent now acknowledge that most scientists agree climate change is happening, up from 40 percent in March 2015 and 33 percent in 2010.

The Yale Program on Climate Change Communication and the George Mason University Center for Climate Change Communication conducted this poll by surveying 1,114 U.S. adults online from Nov. 28 through Dec. 11. The margin of error is 3 percentage points. Brendan Morrow

The ongoing '"MAGA teen" controversy is about to get even bigger.

Nicholas Sandmann, one of the Covington Catholic High School students seen staring down a Native American protestor in a widely circulated video, is sitting down with the Today show's Savannah Guthrie for a segment airing Wednesday. Fox News' Laura Ingraham also tweeted that a group of Covington students would be meeting with President Trump "as early as tomorrow," though a senior White House official disputed that.

A video, seemingly showing a group of teenagers confronting Marine veteran and Native American advocate Nathan Phillips at the Washington, D.C. March for Life, caused an online firestorm this past weekend. In interviews, Phillips said the boys, wearing Make America Great Again hats, confronted and began mocking him. Sandmann countered that in a statement, and now, it seems Guthrie will ask for more of his side of the story.

President Trump praised the boys in a series of tweets Monday and Tuesday. And while Ingraham claimed they were headed for the White House, CBS News' Fin Gomez reports otherwise.

It all makes for an incredibly confusing and controversial news cycle. And, judging by some inflamed responses to Guthrie's announcement, it's nowhere close to over. Kathryn Krawczyk

It looks like Apple Pay is making money moves — by announcing several new partnerships on Tuesday.

Soon customers will be able to use the mobile payment system in all 1,850 Target stores, along with Taco Bell, Speedway convenience stores, Hy-Vee supermarkets, and Jack in the Box. Apple says the addition of these national retailers mean 74 of the top 100 merchants and 65 percent of all retail locations in the U.S. will support Apple Pay.

Vice President of Internet Services at Apple, Jennifer Bailey, cites the system as the easiest and fastest way to pay in stores, in addition to being more secure than using debit or credit cards. And clearly Target agrees, with its Chief Information Officer Mike McNamara describing the move as an effort to begin "offering guests more ways to conveniently and quickly pay."

Target originally partnered with Best Buy and Walmart in 2012 to create payment systems for each individual retailer called the Merchant Customer Exchange (MCX), reports The Verge. Walmart is still holding out by sticking with Walmart Pay, but by the looks of it, Apple Pay might get to the company sooner rather than later. Amari Pollard