Ben Carson has given his backing to Donald Trump
Republican presidential front-runner Donald Trump says he has secured the support of one of his former rivals.
Retired neurosurgeon Ben Carson endorsed the businessman's campaign ahead of a debate last night in Miami.
He pulled out of the contest last week.
However, Trump continues to come in for severe criticism.
In a Republican TV debate last night, his rival Marco Rubio said he was wrong to say that Islam hates the US.
He said while Islam has a problem with radicalisation, many Muslims love the US.
Meanwhile, a video posted by a protestor at a Trump rally of his group being removed from a campaign event has gone viral.
It comes after another man was pulled to the ground and restrained by police on Wednesday after being struck by a man believed to be a Donald Trump supporter at a rally in Fayetteville, North Carolina.
This is what happens when you get "escorted" out of a Donald J. Trump rally....note to self, you have to see how the Cumberland County Sheriffs Dept does Keem Jones after a supporter punches him in the face...Posted by Ronnie C Rouse on Wednesday, 9 March 2016
The Trump campaign has posted a negative campaign ad slamming fellow candidate Marco Rubio on Facebook:
Another Dishonest Politician #LightweightSenatorMarcoRubioPosted by Donald J. Trump on Wednesday, 9 March 2016