FILE - In this June 21, 2017, file photo, special counsel Robert Mueller departs after a meeting on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite, File)

In this Oct. 21, 2018 file photo, Florida Democratic gubernatorial candidate Andrew Gillum speaks during a CNN debate against his Republican opponent Ron DeSantis in Tampa, Fla. Gillum is set to address top Democratic Party donors gathered Tuesday in Washington amid speculation that he’s considering a 2020 presidential bid. The Tallahassee mayor is fresh off a close loss in the Florida governor’s race. Party officials confirmed Gillum is the surprise speaker at a closed gathering of about 300 donors huddling in a Washington hotel. (AP Photo/Chris O'Meara)

FILE - In this June 30, 2018, file photo, U.S. Sen. Kamala Harris, D-Calif., speaks at the "Families Belong Together: Freedom for Immigrants" March in Los Angeles. As Democrats begin to think about the 2020 presidential race, they face a choice between pragmatists who may be able to flip states that President Trump won in 2016 and those such as Harris, Sen. Cory Booker of New Jersey, or Beto O'Rourke of Texas, whose inspirational personal stories may connect with voters on a more emotional level. (Photo by Willy Sanjuan/Invision/AP, File)

In this Dec. 7, 2018 photo, President Donald Trump speaks the 2018 Project Safe Neighborhoods National Conference in Kansas City, Mo. Trump’s growing legal peril has unnerved Republicans who believe the turmoil has left the president increasingly vulnerable as he gears up for what is sure to be a nasty fight for re-election. (AP Photo/Andrew Harnik)

President Donald Trump announces that he is nominating William Barr, attorney general under President George H.W. Bush, as his Attorney General, on the South Lawn of the White House, Friday, Dec. 7, 2018, in Washington. (AP Photo/Evan Vucci)

Former FBI Director James Comey is followed by reporters on Capitol Hill in Washington, Friday, Dec. 7, 2018, following his appearance before a closed-door hearing with the House Judiciary and House Oversight committees. (AP Photo/Susan Walsh)

Michael Cohen, former lawyer to President Donald Trump, leaves his apartment building on New York's Park Avenue, Friday, Dec. 7, 2018. In the latest filings Friday, prosecutors will weigh in on whether Cohen deserves prison time and, if so, how much. (AP Photo/Richard Drew)

FILE - In this Wednesday, Nov. 7, 2018 file photo, Democratic candidate for state attorney general Josh Kaul, right, claims victory during a news conference at the Dane County Courthouse in Madison, Wis. Wisconsin's attorney general-elect, Kaul, campaigned on promises to pull the state out of a lawsuit challenging the Affordable Care Act and to get tougher on polluters. Republicans pushing to hang on to power in Wisconsin and Michigan are trying to hamstring Democrats who are about to take over as attorneys general. (Mark Hoffman/Milwaukee Journal-Sentinel via AP, File)

FILE - In this Nov. 1, 2017, file photo, traffic along Pennsylvania Avenue in Washington streaks past the Federal Bureau of Investigation headquarters building. The National Republican Congressional Committee said Tuesday that it was hit with a "cyber intrusion" during the 2018 midterm campaigns and has reported the breach to the FBI. (AP Photo/J. David Ake)

People gather to protest outside a lame-duck session of the Joint Finance Committee at the Capitol in Madison, Wis., Monday, Dec. 3, 2018. Wisconsin Republicans moved quickly Monday with a rare lame-duck session that would change the 2020 presidential primary date and make sweeping changes to the duties of the governor and attorney general's offices. (Mark Hoffmanf/Milwaukee Journal-Sentinel via AP)