Washington: President Donald Trump took to Twitter Sunday to criticise the millions of people across the United States who marched in protests against him a day earlier, including the celebrities who took part.

‘Watched protests yesterday but was under the impression that we just had an election! Why didn’t these people vote? Celebs hurt cause badly,’ Trump tweeted.

More than two million people flooded US cities Saturday in protests led by women opposed to Trump, who many fear will roll back the rights of women, immigrants and minorities.

The scale of the mass protests, echoed in sister rallies around the world, highlight the depth of resistance to the former reality TV star, two days after he was sworn in as president with an approval rating of just 37 per cent.

Pop diva Madonna made an unannounced appearance Saturday in Washington, joining hundreds of thousands of protesters who rallied for women’s rights in defiance of Trump.

Other celebrities at the massive demonstration included actresses Scarlett Johansson, Ashley Judd and America Ferrera, filmmaker Michael Moore and the feminist icon Gloria Steinem.