Jeb Bush drops out of the US Republican presidential race after a disappointing finish in the South Carolina primary.

Donald Trump, the US real estate tycoon-turned-presidential candidate, topped himself not so long ago - no mean achievement - by outraging the entire world with his demand to ban the entry of Muslims into the US.

US Republican presidential frontrunner Donald Trump says he is planning to spend $2m (£1.3m) a week on campaign advertising.