WASHINGTON (AP) – Virginia Gov. Terry McAuliffe says Donald Trump should provide proof to back up his claim that there was widespread voter fraud in Virginia on Election Day.

The president-elect is claiming, without evidence, that millions of people voted illegally in the election he won. Trump alleged that three states, including Virginia, saw “serious voter fraud.”

Speaking to reporters Monday, McAuliffe laughed when asked about Trump’s comments. The Democratic governor said there was not a single instance of voter fraud occurring in Virginia. He said Trump should “put proof behind” the allegation.

Hillary Clinton easily won Virginia, the only southern state to back her on Election Day.