JK Rowling has branded US presidential candidate Donald Trump 'worse than Voldemort' after he called for Muslims to be banned from entering the US.

The Harry Potter author made the comments after BBC Newsbeat sent her a link to an article entitled 'This is why people are calling American businessman, Donald Trump, Lord Voldemort'.

The former Apprentice host came under fire after calling for a 'total and complete shutdown of Muslims entering US' in a speech on Monday.

Republican rival Jed Bush described Trump as 'unhinged' following the comments and claimed his plans were 'not serious'.

A petition called on Robert Gordon University to revoke Trump's honorary doctorate has received over 3,500 signatures.

Rowling's comment was backed on Twitter, with many claiming Trump defied comparison to any fictional character.