Lindsey Graham says he will ask Mueller to testify before Senate Judiciary

“Apparently Mr. Mueller is willing – and also capable – of defending the Mueller investigation through an oped in the Washington Post,” Graham wrote on Twitter.

He added, “Democrats on the Senate Judiciary Committee have previously requested Mr. Mueller appear before the Senate Judiciary Committee to testify about his investigation. That request will be granted.”

Trump on Friday commuted the prison sentence of his longtime friend, who was convicted of crimes as part of Mueller’s Russia investigation that included lying to Congress in part, prosecutors said, to protect the President. The announcement came just days before Stone was set to report to a federal prison in Georgia.

Stone’s commutation appears to have broken the floodgates with Mueller and his tight-lipped team after a year of silence about their investigation. Throughout the investigation, Mueller’s office refused to comment except in a few rare circumstances. Andrew Weissmann, the special counsel’s office prosecutor who led the investigation of top Trump campaign officials Paul Manafort and Rick Gates, began tweeting about Stone on Friday night.

Mueller, for his part, has been silent since he testified reluctantly under subpoena to Congress last July. And even then, he was circumspect and hesitant to elaborate on his investigation’s findings.

In the op-ed, Mueller pointed out that the people involved in the investigations and prosecutions during his investigation acted with the “highest integrity.”

“We made every decision in Stone’s case, as in all our cases, based solely on the facts and the law and in accordance with the rule of law. The women and men who conducted these investigations and prosecutions acted with the highest integrity. Claims to the contrary are false,” Mueller wrote.

This story has been updated with additional details.

CNN’s Katelyn Polantz, Kevin Bohn and Manu Raju contributed to this story.