Treasury Secretary Steven Mnuchin notified House Democrats on Monday that he will not turn over President Trump's tax returns, claiming that the request from the Ways and Means Committee "lacks a legitimate legislative purpose."

Under a 1924 law, Ways and Means Chair Richard Neal (D-Mass.) is one of just a few lawmakers with the authority to request the president's tax returns, and he asked the IRS for six years of Trump's business and personal returns. In his letter to Neal, Mnuchin said he spoke with officials in the Justice Department and concluded the IRS is "not authorized to disclose the requested returns and return information." He did not explain their reasoning. The law in question does not require Neal to have a legislative purpose.

Democrats argue that to perform their oversight duties, they need to see Trump's tax returns, but Mnuchin says providing them could potentially violate Trump's right to privacy. This move will almost certainly trigger a legal battle, with Democrats expected to file a lawsuit in order to have a federal judge rule on the issue. Catherine Garcia

ABC News and Univision are partnering to host the next Democratic primary debate, and they released details on Wednesday night about what viewers can expect.

The debate will be held at Texas Southern University in Houston, moderated by chief anchor George Stephanopoulos, World News Tonight anchor David Muir, ABC News correspondent Linsey Davis, and Univision anchor Jorge Ramos. One debate will definitely take place on Sept. 12, and a second will be held on Sept. 13 if enough candidates qualify. Participants will have 1 minute and 15 seconds to answer direct questions, and 45 seconds for rebuttals.

Under Democratic National Committee rules, if 10 or fewer candidates meet the requirements to participate, the debate will only take place on one night, but if there are more than 10 candidates, the debate will spill over into a second night. If this happens, on Aug. 29 ABC News will randomly assign candidates to a night. To qualify, candidates must receive at least 2 percent support in at least four specific polls, plus contributions from at least 130,000 unique donors, with a minimum of 400 unique donors from 20 states.

ABC News said that so far, 10 candidates have qualified for the debate: former Vice President Joe Biden; Sen. Cory Booker (D-N.J.); South Bend, Indiana, Mayor Pete Buttigieg; former Housing and Urban Development Secretary Julián Castro; Sen. Kamala Harris (D-Calif.); Sen. Amy Klobuchar (D-Minn.); former Texas Rep. Beto O'Rourke; Sen. Bernie Sanders (I-Vt.); Sen. Elizabeth Warren (D-Mass.); and entrepreneur Andrew Yang. Catherine Garcia

If you watch Bravo or enjoy low-calorie cocktails, you know who Bethenny Frankel is.

Beloved by fans for her snarky commentary, Frankel was one of the original Real Housewives of New York and its biggest star, and used her time on the show to successfully advertise her brand, Skinnygirl, and score a spinoff, Bethenny Ever After. She left RHONY after season three in 2010 and returned in 2015, but announced on Wednesday she's exiting the franchise once again, telling Variety she wants to "explore my next chapter. It's time to move on and focus on my daughter, my philanthropy, and my production partnership with Mark Burnett, producing and starring in shows which represent a shift in the conversation for women."

Frankel's first foray in reality television was on 2005's The Apprentice: Martha Stewart. In addition to starring on RHONY and Bethenny Ever After, Frankel briefly had her own talk show, Bethenny, and another Bravo spinoff, the real estate-themed Bethenny & Fredrik. She has also written several books and launched a charity, B Strong, which has assisted hurricane victims in Puerto Rico, Houston, and North Carolina. Catherine Garcia

Washington Gov. Jay Inslee (D) announced on Wednesday night he is quitting the 2020 presidential race.

Inslee broke the news on The Rachel Maddow Show, and said he is happy that his campaign raised the profile of climate change. "I've been fighting climate change for 25 years and I've never been so confident of the ability of Americans now to reach critical mass to move the ball," he said. "I believe we are going to have a candidate to fight this battle, and I'm inspired by the people I've met across the country."

Inslee said he will support the eventual Democratic nominee, and hopes to help all of the candidates raise their ambition levels when it comes to climate change. He also told Maddow he will make a statement on Thursday regarding whether he will run for governor again. Catherine Garcia

The Centers for Disease Control and Prevention on Wednesday said 16 states have reported 153 cases of serious respiratory illnesses in people who vape.

Most of the patients said they had difficulty breathing and experienced chest pain before going to the hospital, and several also said they used products containing THC, the chemical in marijuana that makes a person high. Officials are trying to get to the bottom of what exactly is causing the illnesses, and are now trying to determine which products were used. Doctors say it will be difficult to track the illness, because it is not mandatory to report vaping-related lung disease.

The cases were reported from June 28 to August 20, with mostly teenagers and young adults affected. The CDC said it has not received any reports of death linked to the illness. Catherine Garcia

A California state senator who authored a bill to restrict vaccine exemptions was assaulted in Sacramento on Wednesday by an anti-vaccine activist, police said.

State Sen. Richard Pan (D) was walking with a colleague when Kenneth Austin Bennett pushed him from behind, the Los Angeles Times reports. Bennett livestreamed the incident on Facebook, and is heard saying, "I probably shouldn't have done that." When he uploaded the video, he added the caption: "Yes, I pushed Richard Pan for lying, laughing at us, and for treason." Pan, he continued, "got what he deserved, he would be hanged for treason for assaulting children, for misrepresenting the truth."

Pan was not hurt in the incident. Bennet was cited for assault and has been released. In 2018, Bennett tried to challenge Pan in the primary, but did not qualify for the general election. Earlier this year, he filed a recall petition against Pan, accusing him of committing treason because he wants more kids in the state to be vaccinated.

Ever since Pan wrote his 2015 bill tightening vaccine requirements for kids in schools, he has been targeted by anti-vaxxers, his spokeswoman Shannan Velayas told the Times. "This is moving from a peculiar fringe curiosity to a violent extremist movement," she said. "Unfortunately, this is not a surprise when violent rhetoric is used." Catherine Garcia

One day after saying the White House was considering new tax cuts to boost the economy, President Trump reversed course, telling reporters he isn't contemplating reducing capital gains and payroll taxes.

"I just don't see any reason to," he said Wednesday. "We don't need it. We have a strong economy." Trump and his aides have been pushing this narrative, saying there is no recession in sight and dismissing warning signs like an inverted yield curve last week and the growth in economic output dropping to a 2.1 percent annual rate in the second quarter, well below the 3.1 percent growth rate in the first three months of 2019.

Trump's announcement on Tuesday that he was interested in pay cuts came as a surprise to several White House staffers who told The Wall Street Journal they haven't been considering any of Trump's ideas. "The president threw it out ... but he was just throwing things out," one official said regarding payroll tax cuts.

Trump has been urging the Federal Reserve to cut interest rates quickly, which the Journal notes is usually done when the economy is struggling. He's bashed Fed Chairman Jerome Powell on several occasions, accusing him of holding U.S. growth back, and on Wednesday, the president compared Powell to "a golfer who can't putt." Catherine Garcia