He backed the President despite the barrage of attacks and in his resignation letter thanked Mr Trump for the opportunity to serve. When his letter of resignation was published, it showed that the president has asked him to resign - effectively firing the embattled attorney.
The US attorney general, Jeff Sessions, said he was resigning Wednesday at the request of President Donald Trump in a move that raises questions over the future of a bombshell probe into the president's alleged collusion with Russian Federation. In August of past year, he wrote an op-ed for CNN titled "Mueller's investigation of Trump is going too far", where he denounced the special counsel's decision to look into the Trump family finances.
Democratic Senate Minority Leader Chuck Schumer said Wednesday that "it would create a constitutional crisis if this were a prelude to ending or greatly limiting the Mueller investigation".
Mr Sessions's chief of staff - Matthew Whitaker - has been appointed Acting Attorney-General. "Suppress Mueller investigation", argued University of California Berkeley professor Robert Reich. In a September interview, Trump said, "I don't have an attorney general".
He later backed Mr Trump's controversial ban on people from several Muslim-majority countries from entering the United States.
"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. He is a conservative who has written op-eds in the past suggesting that the Mueller Investigation of Trump and the 2016 election has gone "too far", and has also run for elected office three times in the past, all times as a Republican. But even as he continued to implement the Trump agenda, his relationship with the President remained strained and fraught for months due to the ongoing Mueller investigation.