Donald Trump's campaign manager Paul Manafort quits

The chairman of US Republican presidential hopeful Donald Trump quit amid a flurry of reports alleging that he might have received undisclosed cash payments from a Ukrainian political party.

“This morning Paul Manafort offered, and I accepted, his resignation from the campaign,” Trump said in a statement.

“I am very appreciative for his great work in helping to get us where we are today, and in particular his work guiding us through the delegate and convention process. Paul is a true professional and I wish him the greatest success.”