Ex-Republican presidential candidate Carson backs Trump

US presidential candidate Donald Trump talks with Dr Ben Carson during the Republican presidential debate in Las Vegas, Nevada on Dec 15, 2015.
US presidential candidate Donald Trump talks with Dr Ben Carson during the Republican presidential debate in Las Vegas, Nevada on Dec 15, 2015. PHOTO: REUTERS

PALM BEACH (Reuters) - Former rival Ben Carson backed Republican presidential front-runner Donald Trump on Friday (March 11), becoming the second former presidential candidate to support the billionaire businessman in the race for the White House.

Carson, a retired neurosurgeon who dropped out of the race on March 4, follows New Jersey Governor Chris Christie, a former candidate who also backed Trump after earlier dropping out of the race for the party's nomination ahead of the Nov. 8 presidential election.

Carson made the announcement at a joint news conference with Trump in Florida, ahead of that state's primary on Tuesday.