Whitaker, who moved up to acting attorney general after serving as Sessions' chief of staff, was a CNN legal commentator and executive director of a group called the Foundation for Accountability and Civic Trust at the time of the op-ed piece, according to his LinkedIn page.
U.S. Attorney General Jeff Sessions resigned from office Wednesday.
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With the midterms over, Special Counsel Robert Mueller is believed to be preparing fresh indictments against Trump campaign figures, possibly including his son Donald Trump Jr. and a former campaign consultant Roger Stone, and could press for the president himself to answer questions.
U.S. Attorney General Jeff Sessions speaks during a news conference discussing new criminal law enforcement action against China for economic espionage on November 1, 2018 in Washington, DC.
The same month, he said that while the promised dirt on Hillary Clinton offered by Russian friends of the Trumps turned out to be a "ludicrous" conspiracy theory about Russian funding of the Democrats, there was nothing improper about the campaign agreeing to the meeting.
In an interview on "CNN Newsroom", Dean said the ouster was "unlike the Saturday Night Massacre" of October 1973, when the embattled Nixon fired special prosecutor Archibald Cox, and accepted the resignations of his attorney general and deputy attorney general amid the Watergate scandal.
Several GOP officials in Iowa who have known Whitaker for a long time say they were surprised by his shift in the Trump era.
Whitaker will now be in control of the Mueller investigation.
"At your request I am submitting my resignation", Sessions wrote in a letter to White House chief of staff John Kelly. Democrats worry that firing Sessions is a path to removing special counsel Robert Mueller and trying to end the probe.