Senate Intelligence Chairman Richard Burr (L), R-N.C.; and Senate Intelligence Vice Chair Mark Warner, D-Va., hold a news conference on the status of the committee's inquiry into Russian interference in the 2016 election on Capitol Hill in Washington, DC, October 4, 2017. (JIM WATSON/AFP/Getty Images)
German Chancellor Angela Merkel greets US President Donald Trump prior to the start of the first working session of the G20 meeting in Hamburg, northern Germany, on July 7.
Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / POOL / IAN LANGSDON (Photo credit should read IAN LANGSDON/AFP/Getty Images)
German Chancellor Angela Merkel greets US President Donald Trump prior to the start of the first working session of the G20 meeting in Hamburg, northern Germany, on July 7.
Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / POOL / IAN LANGSDON (Photo credit should read IAN LANGSDON/AFP/Getty Images)
German Chancellor Angela Merkel greets US President Donald Trump prior to the start of the first working session of the G20 meeting in Hamburg, northern Germany, on July 7.
Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / POOL / IAN LANGSDON (Photo credit should read IAN LANGSDON/AFP/Getty Images)
Former FBI Director Robert Mueller, special counsel on the Russian investigation, leaves following a meeting with members of the US Senate Judiciary Committee at the US Capitol in Washington, DC on June 21, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
CLEVELAND, OH - JULY 17: Paul Manafort, campaign manager for Republican presidential candidate Donald Trump, is interviewed on the floor of the Republican National Convention at the Quicken Loans Arena July 17, 2016 in Cleveland, Ohio. The Republican National Convention begins tomorrow. (Photo by Win McNamee/Getty Images)
German Chancellor Angela Merkel greets US President Donald Trump prior to the start of the first working session of the G20 meeting in Hamburg, northern Germany, on July 7.
Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / POOL / IAN LANGSDON (Photo credit should read IAN LANGSDON/AFP/Getty Images)
WASHINGTON, DC - SEPTEMBER 14: U.S. President Donald Trump and first lady Melania Trump depart the White House September 14, 2017 in Washington, DC. Trump is scheduled to visit Florida today to view relief efforts in the wake of Hurricane Irma. Trump also spoke on reports from a meeting with Democratic leaders last night about a proposed deal on DACA and potentially delaying negotiations on his efforts to build a wall on the U.S. border with Mexico. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - JUNE 08: Former FBI Director James Comey testifies before the Senate Intelligence Committee in the Hart Senate Office Building on Capitol Hill June 8, 2017 in Washington, DC. Comey said that President Donald Trump pressured him to drop the FBI's investigation into former National Security Advisor Michael Flynn and demanded Comey's loyalty during the one-on-one meetings he had with president. (Photo by Drew Angerer/Getty Images)
WASHINGTON, DC - SEPTEMBER 6: Sen. Richard Burr (R-NC) arrives at the Capitol ahead of the weekly party luncheons September 6, 2017 in Washington, DC. Legislators from both parties are preparing for an intense calendar of issues in the coming weeks including tax and immigration reform. (Photo by Aaron P. Bernstein/Getty Images)
German Chancellor Angela Merkel greets US President Donald Trump prior to the start of the first working session of the G20 meeting in Hamburg, northern Germany, on July 7.
Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / POOL / IAN LANGSDON (Photo credit should read IAN LANGSDON/AFP/Getty Images)