Donald Trump looked to forestall perhaps the most keenly awaited event in Washington in decades — a congressional hearing with special counsel Robert Mueller — saying "Bob Mueller should not testify. No redos for the Dems!"

The president's comment, in a pair of Twitter postings on Sunday, came hours after a Democratic member of the House Judiciary Committee said that a "tentative date" of May 15 had been set for testimony by the former FBI director to discuss his investigation into the 2016 election.

"We hope the special counsel will appear," Rep. David Cicilline of Rhode Island, said on "Fox News Sunday." "We think the American people have a right to hear directly from him."