US President Donald Trump has criticised Lady Gaga after the pop singer lent her support to his Democratic Party rival Joe Biden on the eve of the US presidential election.

Trump (74) called out Gaga (34) during one of his rallies in Biden's home state of Pennsylvania, telling the crowd, "I could tell you stories about Lady Gaga".

"Now he’s got Lady Gaga," Trump said in reference to Gaga's endorsement of Biden, before adding cryptically, "Lady Gaga is not too good. I could tell you plenty of stories. I could tell you stories about Lady Gaga.

"I know a lot of stories about Lady Gaga. And Jon Bon Jovi? Everytime I see him, he kisses my ass. 'Oh, oh, Mr. President.’"