He followed up early Sunday with a barrage of tweets, including two in which he says he has \"nothing to hide\" and that he has \"demanded transparency so that this Rigged and Disgusting Witch can come to a close.\"

The failing @nytimes wrote a Fake piece today implying that because White House Councel Don McGahn was giving hours of testimony to the Special Councel, he must be a John Dean type “RAT.” But I allowed him and all others to testify - I didn’t have to. I have nothing to hide......

— Donald J. Trump (@realDonaldTrump) August 19, 2018

....and have demanded transparency so that this Rigged and Disgusting Witch Hunt can come to a close. So many lives have been ruined over nothing - McCarthyism at its WORST! Yet Mueller & his gang of Dems refuse to look at the real crimes on the other side - Media is even worse!

— Donald J. Trump (@realDonaldTrump) August 19, 2018

Mueller had requested to speak with McGahn about the circumstances surrounding former FBI Director James Comey’s firing and his reported involvement in the event surrounding Attorney General Jeff Sessions’ recusing himself from the Russia investigation, the sources said.

ABC News reported earlier this year that McGahn was among the White House staffers who were against any notion of President Trump’s firing of special counsel Robert Mueller last June when the president wanted to do just that, a source said.

ABC News' Benjamin Siegel and Meridith McGraw contributed to this report.

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