US Department of Justice has allowed federal prosecutors to pursue investigations into "evidence-backed allegations" of "irregularities" that may have been committed during the recent presidential election.

US Attorney General William Barr urged, in a memo to federal prosecutors and the FBI, to not pursue "false or far-fetched" allegations that were not based on concrete evidence.

It is the first time that Barr speaks after repeated accusations made by US President Donald Trump, and a number of members of the Republican Party, about "widespread" fraud, as he described it.

This came several hours after Barr met with the leader of the Republican majority in the Senate Mitch McConnell, who said earlier, Monday, that Trump had the right to file lawsuits to consider what he described as "irregularities" that took place in last weeks elections.

The Trump campaign announced that a number of lawsuits had been filed to question the announcement of Joe Bidens victory, which was reported by American media. The most recently lawsuit was filed against the mail voting system in Pennsylvania.

The lawsuit calls for an emergency injunction to stop those responsible for certifying the victory of the Democratic candidate Joe Biden in the state.

In a tweet, Monday, Trump said that Pennsylvania had "prevented us from observing the vote count" and that there were invalid votes in Nevada.

Trump had previously launched a series of allegations of fraud without providing any evidence, and said he had won the election after media outlets announced that Biden had won.

Biden currently has 290 electoral votes, surpassing the minimum required to win, while Trump received 214 votes

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