Update 1450ET: WaPo's Josh Dawsey reports:

Senior White House official comes to back of Air Force One and tells reporters Trump is "OK" releasing the memo and he will tell Congress that "probably tomorrow," per pooler @tparti. Official declined to take any questions or be identified publicly, per pool.

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Update 1445ET: Speaker Paul Ryan dismissed Nancy Pelosi and Chuck Schumer's demands that Nunes resign, saying Congress is "doing its job of oversight" with the memo, adding that "if civil liberties were abused with FISA, then the memo needs to come out."

Ryan adds:

RYAN SAYS IMPORTANT TO SCRUB MEMOS TO PROTECT SOURCE, METHODS

RYAN SAYS MEMO PROCESS IS EXACTLY WHAT IT SHOULD HAVE BEEN

RYAN SAYS MEMO CHANGES MADE BEFORE VOTE

And Ryan concluded by noting that "the vast majority of FBI employees are doing a great job."