In this photo taken Oct. 4, 2018, eastbound Interstate 90 traffic passes beneath a wildlife bridge under construction on Snoqualmie Pass, Wash. The stretch of highway crossing the Cascade Mountains cuts through old growth forest and wetlands, creating a dangerous border for wildlife everything from an elk down to a small salamander. The new crossing gives animals in these mountains a safer option for crossing the road: They'll be able to go above it. (AP Photo/Elaine Thompson)

Pest Control Officers Gregory Cornes, left, uses a hand trowel to scoop-up dry ice before dropping it directly into rat burrows, as his co-worker Curtis Redman assist, near the Capitol building in Washington, Wednesday, Nov. 21, 2018. Both are from the Department of Health's Rodent Control Division. The nation’s capital is facing a spiraling rat infestation, fueled by mild winters and a human population boom. Washington’s government is struggling to keep pace (AP Photo/Pablo Martinez Monsivais)

FILE - In this Sept. 27, 2018, file photo, Sen. Kamala Harris, D-Calif., listens to Christine Blasey Ford testify during the Senate Judiciary Committee hearing on the nomination of Brett Kavanaugh to be an associate justice of the Supreme Court in Washington. Democrats are trying to turn their most painful losses this year into a rallying cry they hope will electrify the 2020 presidential campaign: Every vote matters. (Tom Williams/Pool Photo via AP)

House Minority Leader Nancy Pelosi of Calif., left, speaks to a reporter as she and Senate Minority Leader Sen. Chuck Schumer of N.Y., right, walk back into the West Wing after speaking to members of the media outside of the White House in Washington, Tuesday, Dec. 11, 2018, following a meeting with President Donald Trump. (AP Photo/Andrew Harnik)

FILE - In this July 10, 2018 file photo, former Trump national security adviser Michael Flynn leaves federal courthouse in Washington, following a status hearing. (AP Photo/Manuel Balce Ceneta)

House Minority Leader Nancy Pelosi of Calif., right, accompanied by Senate Minority Leader Sen. Chuck Schumer of N.Y., left, speaks to members of the media outside the West Wing of the White House in Washington, Tuesday, Dec. 11, 2018, following a meeting with President Donald Trump. (AP Photo/Andrew Harnik)

FILE - In this July 10, 2018 file photo, former Trump national security adviser Michael Flynn leaves federal courthouse in Washington, following a status hearing. (AP Photo/Manuel Balce Ceneta)

FILE - In this Oct. 31, 2018, file photo, former Vice President Joe Biden speaks during a rally in Bridgeton, Mo. Biden is wrapping up a busy stretch of events before stepping out of the public eye and holding private deliberations over whether he'll launch another campaign for president. That's according to multiple sources familiar with Biden's thinking. (AP Photo/Jeff Roberson, File)

FILE - In this Oct. 11, 2018, file photo, adult film actress Stormy Daniels arrives for the opening of the adult entertainment fair "Venus" in Berlin. A federal judge has ordered porn star Stormy Daniels to pay Donald Trump nearly $293,000 for his attorneys' fees and another $1,000 in sanctions after her defamation suit against the president was dismissed. Judge S. James Otero made the order Tuesday, Dec. 11, 2018, in Los Angeles. Attorney Michael Avenatti, who represents Daniels, tweeted the order "will never hold up on appeal." (AP Photo/Markus Schreiber, File)

Vice President Mike Pence, center, looks on as House Minority Leader Rep. Nancy Pelosi, D-Calif., argues with President Donald Trump during a meeting in the Oval Office of the White House, Tuesday, Dec. 11, 2018, in Washington. (AP Photo/Evan Vucci)