WASHINGTON: US President Donald Trump renewed baseless allegations of voter fraud on Monday, questioning the legitimacy of last week's midterm elections after Democrats swept both chambers of Congress in a crushing defeat for his Republican Party.

"Does anybody really believe that this 'Election' was honest. How could the Polls be so wrong???" Trump wrote on Truth Social, alleging without evidence that large early-voting "dumps" had made Republican victories impossible.

"It's all about the machines, which are far more important than the voter!" he added.

The accusations marked a sharp reversal from Trump's initial acceptance of the results. "I am absolutely willing to accept those results," he told The New York Times on election night.