President Donald Trump lost his bid for a second term and a new Gallup poll shows that he continues to lose support, even among Republicans, as he continues to allege without evidence that the election was rigged.

"The President's job approval rating is the lowest it has been since June when it fell sharply amid protests nationwide about racial injustice following George Floyd's death while in police custody," the polling firm said this week.

President Trump's approval rating has dropped to 39 per cent, seven percentage points lower than before the November 3 election.

The latest December 1-17 Gallup poll was conducted as COVID-19 cases surged in the US, Democrats and Republicans fought over more stimulus help and President Trump continued to deny Joe Biden won the election.

President Trump's approval rating has fallen seven and eight points, respectively, among Republicans and independents since Gallup's final pre-election readings in October, the poll found.

Currently, 87 per cent of Republicans, 34 per cent of independents and 6 per cent of Democrats approve of his job performance. Support for Trump from Republicans stood as high as 95 per cent in October.

"Although the President is not acknowledging the election outcome, many Republicans appear to be as their views of the economy and satisfaction with the direction of the country have worsened in the last month.

"The lack of a concession from Trump has not hampered views of President-elect Biden as nearly two in three Americans approve of the way he is handling his transition."