Prominent Republicans in the US Congress on Sunday urged Donald Trump to \u201cfight hard\u201d and not concede his loss to Joe Biden in the race for the White House, saying unfounded allegations of fraud by the president must be investigated. Some of the Republicans also told Trump that legal challenges must be allowed to play out before he takes the next action. We will work with Biden if he wins, but Trump has not lost,\u201d Senator Lindsey Graham of South Carolina said on Fox News. \u201cDo not concede, Mr. President. Fight hard.\u201d Graham baselessly alleged \u201cshenanigans\u201d related to mailed ballots, the method a large number of Americans preferred in Tuesday\u2019s election due to the coronavirus pandemic. \u201cIt\u2019s the wild-wild west when it comes to mail-in balloting,\u201d said Graham, a former Trump critic turned unstinting supporter. There is no evidence that fraud has ever been a significant problem affecting mail-in voting in US presidential elections. \u201cEverything we worried about has come true, so if we don\u2019t fight back in 2020 we\u2019re never going to win again presidentially,\u201d he nevertheless added. Other top Republicans were more guarded in their comments, but nonetheless refused to acknowledge Biden had won, saying legal challenges must go forward and vote counting must continue. \u201cWhat we need in the presidential race is to make sure every legal vote is counted, every recount is completed, and every legal challenge should be heard,\u201d Kevin McCarthy, the top Republican in the House of Representatives, said on\u00a0Fox News. \u201cThen and only then that America will decide who won the race.\u201d Trump has repeatedly made groundless allegations of fraud and has even claimed that he won the election despite projections based on results showing Biden as the clear victor. Biden currently has at least 279 electoral votes, with only 270 needed to win. Trump has 214.