Former Trump adviser Sam Nunberg expected to meet with special counsel team

A former Trump campaign staffer will meet with the special counsel's team.

In an interview with ABC News' "The Briefing Room" on Jan. 4, Nunberg said he "probably" called the commander-in-chief an "idiot" in the conversation with Wolff, but maintained that the comment was sarcastic.

Nunberg also declined to dispute another exchange in the book in which he reportedly described his struggle to explain the Constitution to Trump.

Nunberg was fired in August of 2015.

Nunberg declined ABC News' request for comment.

This is a developing story. Please refresh for details.