Trump says 'I hate Taylor Swift!' in Truth Social post

Republican US presidential candidate Donald Trump has declared his "hate" for Taylor Swift just days after the pop mega-star endorsed his Democratic opponent Kamala Harris.

In an all-caps posting on his Truth Social media account, Trump wrote, "I HATE TAYLOR SWIFT!"

Immediately following last week's Trump-Harris debate, Swift informed her 284 million Instagram followers that she planned to vote for Harris, currently the US vice president "because she fights for the rights and causes I believe need a warrior to champion them".

Trump, who has 7.71 million followers on Truth Social, initially had dismissed Swift's endorsement of Harris by saying he was "not a Taylor fan".

Swift's backing of Harris has drawn more than 9 million "likes" to her Instagram post, fuelling speculation that it could boost the Democrat's chances of winning the presidential election.

After the Trump post, Harris' vice presidential running mate Tim Walz wrote on X: "Swifties: With your help we're gonna defeat the smallest man who ever lived."

One of Swift's songs is titled The Smallest Man Who Ever Lived.

Trump's rage against Swift brought a torrent of supporters to proclaim on X, "I LOVE TAYLOR SWIFT" while others came to Trump's defence by attacking the administration of Democratic President Joe Biden.

Trump and Swift have been trading barbs for years.

After she supported Democratic candidates in the 2018 elections, Trump said in response to reporters' questions at the White House: "Let's say that I like Taylor's music about 25 per cent less now".