Mr Sessions's chief of staff - Matthew Whitaker - has been appointed Acting Attorney-General. He backed the President despite the barrage of attacks and in his resignation letter thanked Mr Trump for the opportunity to serve.
"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. That's because, Trump said, he wanted the Secretary of State to join him in Washington.
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Sessions was often a target of Trump's after he recused himself from the Russian Federation investigation in May 2017, as noted by The New York Times. As this news circulated, President Trump took to Twitter with a message of his own, focusing more on Sessions' temporary replacement. The New York Times speculated that bypassing Rosenstein "might clear the way for Mr. Trump to fire Mr. Mueller".
If the firing was indeed done to place someone "adverse to the existence of the Mueller investigation" in charge who "wants to dry it up by the shrinking its budget, that would be an improper goal".
He also said the "facts show it was gross negligence" when Clinton used a personal email system and therefore "removed the information from State Department security".
During a brief stint past year as a conservative legal commentator on CNN, Whitaker often appeared as a Trump defender, saying he saw no evidence the president colluded with Russians during the 2016 campaign or obstructed justice.
And U.S. Rep. Jerry Nadler - who the Associated Press says is in line to be the chairman of the Judiciary panel when Democrats take control of House in January after the 2018 midterms - warned that "we will be holding people accountable". "It's very sad", Trump told The Hill in September. They now have subpoena power over things like Mr Trump's tax returns and have indicated they are willing to use it. He did not mention Sessions, and said that he was overall "extremely" happy with his Cabinet.
The man who will serve at least temporarily as the nation's top law enforcement official is a relatively inexperienced Republican Party loyalist from Iowa who has called for limiting special counsel Robert Mueller's investigation.