Republicans are running short of time, money and options to stop Democrats from winning a majority of seats in the U.S. Senate, and with them full control of Congress, in an election that is now only two weeks away.

President Donald Trump's slide in opinion polls is weighing on Senate Republicans in 10 competitive races, while Democrats are playing defense over two seats, increasing the odds of Trump's Republicans losing their 53-47 majority on Nov. 3.

That gives Democrats a good chance of adding a Senate majority to their control of the House of Representatives, which could either stymie Trump in a second term or usher in a new era of Democratic dominance in Washington if Democratic presidential candidate Joe Biden wins the White House.