Former FBI Deputy Director Andrew McCabe reportedly took contemporaneous memos about his interactions with President Donald Trump, among other things.
McCabe said his firing on Friday was a political hit job. The Justice Department said he misled investigators.
McCabe could be a potential witness for special counsel Robert Mueller. That's because he might be able to corroborate the testimony of his former boss, James Comey, about Comey's interactions with the president.
If the memos echo those taken by Comey following his own interactions with Trump, they could be evidence in a possible obstruction of justice case against the president.
Additional reporting from Newsy affiliate CNN.