Ben Carson confirms support for Donald Trump
Former candidate endorses billionaire for Republican nomination for White House
Republican US presidential candidate Donald Trump speaks after receiving the endorsement of former candidate Ben Carson at a campaign event in Palm Beach, Florida. Photograph: Carlo Allegri/Reuters
Republican presidential front-runner Donald Trump won another high-profile endorsement on Friday when retired neurosurgeon Ben Carson became the second former Republican candidate to back him in the race for the White House.