The aide, Craig Deare, was serving as the NSC’s senior director for Western Hemisphere Affairs. Earlier in the week, at a private, off-the-record roundtable hosted by the Woodrow Wilson Center for a group of about two dozen scholars, Deare harshly criticized the president and his chief strategist Steve Bannon and railed against the dysfunction paralyzing the Trump White House, according to a source familiar with the situation.

He complained in particular that senior national security aides do not have access to the president — and gave a detailed and embarrassing readout of Trump’s call with Mexican president Enrique Pena Nieto.