Donald Trump has backed a rap contest urging his supporters to post their videos on social media to “make liberals cry”.

The US president promised to invite the winners of the ‘MagaChallenge” to meet him and perform at the White House.

He made the announcement on Twitter on Friday, shortly after launching his “Black Voices for Trump” election campaign in Atlanta, Georgia.

The contest was originally launched by amateur rapper Bryson Gray in September, who told his followers: “I want y’all to your own rap to it too then tag me! Lets make liberals cry!”

In his contribution to the song “MAGA Boy”, he wore a variety of red MAGA (Make America Great Again) hats while rapping: “All these liberals trying to tell me who I am... said I wasn’t Democrat and lost a few friends”.

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Mr Trump retweeted the video with the message: “I will be announcing the winners of the #MAGACHALLENGE and inviting them to the White House to meet with me and perform. Good luck!”

The entrants have included Isaiah Washington, an actor who was dropped from the hit TV show Grey’s Anatomy after insulting a co-star using a homophobic slur.

Others include a young woman who raps in support of Mr Trump with the lyrics: ”Keep America great, he is here to stay, deporting illegals every single day.”

Another entrant spits the bars: “Land of the free, home of the brave, I’m the new black Moses here to free the slaves from the Democrats, break the chain.”

The contest has also drawn mockery from opponents of the president, with many joking that liberals were instead “crying with laughter”.

Others pointed out Mr Trump’s failure to announce the winners of previous competitions run by his campaign.

One woman who won a contest to have breakfast with the president in New York was instead invited to a buffet attended by Donald Trump Jr and other Republican figures.