The big picture: The cache includes summaries of FBI interviews with President Trump's former personal counsel Michael Cohen, former FBI director James Comey, former White House communications director Hope Hicks and Trump's 2016 campaign manager Corey Lewandowski.
Comey: Impeachment will test the meaning of the oath of office
Former FBI Director James Comey suggested in a Washington Post op-ed Wednesday that elected officials should uphold their oaths of office by removing President Trump from office.
The big picture: Comey questioned whether members of Congress would be upholding their oaths if they do not take action against Trump for allegedly withholding military aid to Ukraine to pressure its government to investigate his political rivals. Comey specifically singled out Sen. Rob Portman (R-Ohio), who voted to impeach former President Bill Clinton but has said Trump's actions don't warrant impeachment.