Democrat Joe Biden will be able to be in the White House only if he proves that the votes cast for him in the election were obtained legally, the current US leader Donald Trump wrote on Twitter.

“Biden can only enter the White House as President if he can prove that his ridiculous ’80 million votes’ were not obtained fraudulently or illegally,” Trump said.

The example of Detroit, Atlanta, Philadelphia, and Milwaukee, where, according to Trump, there were mass falsifications, shows that Biden has “a big unsolvable problem.”

Earlier, the American leader said that he would leave the White House if the electors vote for Biden. However, according to Trump, in this case, “they will make a mistake.” The President again declared “massive fraud” during the vote.

Trump does not admit defeat and challenges it in several states’ courts, while he has already ordered the transfer of power to the Democrat. Rudy Giuliani, the President’s lawyer, said the voting irregularities were systemic.

Members of the Electoral College must vote on December 14. The next head of state will be sworn in on January 20.