Former US president Donald Trump, the leading Republican presidential candidate, is the "king of hypocrisy", the campaign of his sole GOP challenger Nikki Haley alleged Tuesday, intensifying the war of words between the two camps.

"Trump is the king of hypocrisy. He rants and raves about Nikki Haley's campaign supporters but a new report from RealClearPolitics analyzed Donald Trump's FEC filings and revealed a long list of Democrat mega donors who actively funded candidates like Chuck Schumer and Hillary Clinton," the Haley Campaign said in a statement.