Sessions has long faced criticism from Trump for recusing himself from Mueller’s investigation of Russia’s alleged meddling in the 2016 presidential election. Mueller is also probing possible collusion between Moscow and the Trump campaign, allegations both sides have repeatedly denied.
READ MORE: Dems to Make Trump's Tenure Difficult But Lack Power to Impeach Him — Analysts
In fact, Trump has repeatedly referred to Mueller’s probe as a "witch hunt."
Republican control of both chambers of Congress had actually checked the ambitions of the Democrats, who have been warning for months that once they capture the House they will intensify congressional probes into Trump’s ties to Russia.
As a result of Tuesday’s midterm elections, the Republicans lost that control because although they kept the Senate, the Democratic Party seized the House of Representatives.
Hence, the timing of what Trump tweeted on Wednesday struck many as conspicuous.
"We are pleased to announce that Matthew G. Whitaker, Chief of Staff to Attorney General Jeff Sessions at the Department of Justice, will become our new Acting Attorney General of the United States," Trump said via Twitter on Wednesday. "We thank Attorney General Jeff Sessions for his service, and wish him well! A permanent replacement will be nominated at a later date."
Sessions in his resignation letter on Wednesday said he had resigned "at the request" of Trump.
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"In my time as Attorney General we have restored and upheld the rule of law," Sessions said in the letter addressed to Trump. "We have operated with integrity and have lawfully and aggressively advanced the policy agenda of this administration."
As the top official at the Justice Department, Whitaker is now in charge of the Mueller probe because he outranks Deputy Attorney General Rod Rosenstein, who took charge due to Sessions' recusal.
Whitaker has previously questioned the scope of the Mueller probe, writing an opinion column for CNN last year charging that the investigation would be going too far if expanded to include Trump family finances.
Democratic Explosion
The move of course set off fireworks among Democratic lawmakers. US Senate Minority Leader Chuck Schumer shortly after the news broke said in a statement that Whitaker in his new role should recuse himself from overseeing Mueller's investigation.
READ MORE: GOP Senator Lindsey Graham Working to Oust Sessions as US Attorney General
"Given his previous comments advocating defunding and imposing limitations on the Mueller investigation, Mr. Whitaker should recuse himself from its oversight for the duration of his time as acting attorney general," Schumer said via Twitter on Wednesday.
About six Congressional Democrats including Senators Bernie Sanders, Elizabeth Warren, Ron Wyden and Cory Booker stressed that Trump may be attempting to disrupt the Mueller investigation and called on Whitaker to recuse himself.
The American Civil Liberties Union (ACLU) Executive Director Anthony Romero said in a statement on Wednesday that the US Senate must ensure that whomever Trump nominates to replace Sessions will not interfere in Mueller’s Russia investigation.
However, the ACLU had a few other choice departing words for the now former Attorney General.
"Sessions was the worst attorney general in modern American history. He was an egregious violator of civil rights and civil liberties," the ACLU statement said. "Sessions allowed the Department of Justice to function as the political arm of the Trump administration to undo fundamental rights that protect each of us, disregarding years of legal precedent and settled law."
Trump’s nomination of a permanent replacement for Sessions will require confirmation by the US Senate, which remains in Republican control following Tuesday’s midterm elections.
Moscow has repeatedly rejected allegations of election meddling, characterizing them as unfounded fabrications and attempts by US politicians and media to fuel Russophobic hysteria.
