S Attorney General William Barr said on Monday that he will step down from the Department of Justice next week, shortly after the Electoral College confirmed President Donald Trump's loss to President elect Joe Biden.

Trump announced bars resignation in a tweet, saying he would leave his post just before Christmas to spend the holidays with his family, adding that Deputy Attorney General Jeff Rosen would take his place bar anger Trump in early December when he did not support the US president's false claims of widespread fraud in the November election.

He said the Justice Department had not seen fraud on a scale that could have affected a different outcome in the election.

Trump has previously lashed out at Bar on Twitter over the weekend, calling him a big disappointment after The Wall Street Journal reported that Barnouw earlier this year about an investigation into the president elect Joe Biden's son Hunter and his tax affairs.

But late on Monday, along with bars resignation letter, Trump tweeted that their relationship had quote been a very good one and that bar had done announced standing job.

A White House official told Reuters that Bar resigned on his own accord Trump's legal team had accused Bar of failing to conduct a proper investigation into allegations of voter fraud bars Resignation letter was released shortly after he briefed the president about Justice Department's review into the Trump campaign's voter fraud claims.

In the letter, Bar pledged that allegations of fraud would continue to be pursued.

Trump, who lost the presidential election, has refused to concede, and despite pursuing a Siris of legal challenges in numerous states, he has not managed to prevail in any of them.