Leaders of the U.S. Senate Intelligence Committee said on Wednesday they had reached an agreement that would allow them to see memos written by former FBI Director James Comey about his meetings with President Donald Trump.

Comey's relationship with Trump has been central to ongoing investigations of Russian meddling in the 2016 U.S. election and whether there was collusion between Trump associates and Moscow. Lawmakers have raised questions about whether Trump fired Comey on May 9 in order to interfere with the Russia probe.

Russia has denied such assertions. Trump, a Republican, has dismissed them as sour grapes voiced by Democrats disappointed by his victory and called them a "witch hunt."