Rep. Adam Schiff — the top Democrat on the House committee investigating possible collusion between the Trump campaign and the Kremlin — told CNN's Jake Tapper there's concern on both sides of the aisle about Trump's mental fitness.

“I don't think there's anyone in Congress, frankly, of either party who does not concur at least privately with those observations and concerns" about Trump's "capacity to do the job." The issue of Trump's state of mind has been the source of intense speculation after a new book by journalist Michael Wolff claimed that aides closest to the president question his mental stability.