>> Read the latest from our Washington Insider, Jamie Dupree
In a letter to Mueller accompanying the subpoenas, the committee chairmen said “the American public deserves to hear directly from you about your investigation and conclusions.”
President Donald Trump has denied all wrongdoing and consistently framed Mueller’s investigation as an expensive and politically motivated “witch hunt” aimed at hurting his presidency.
Late Tuesday, Trump appeared to respond to the news in a tweet.
"Presidential Harassment!" he wrote.
The Associated Press contributed to this report.