Rep. Jerry Nadler, chairman of the House Judiciary Committee, has sent a letter to special counsel Robert Mueller asking him to testify soon.

"I request your testimony before the the Judiciary Committee as soon as possible — but, in any event, no later than May 23, 2019," he wrote.

Speaker of the House Nancy Pelosi and Senate Minority Leader Chuck Schumer have already called on Mueller to testify.

Here's Nadler's letter: