Chris Christie suspends his presidential campaign

STORY: Christie dropped out just days before the first Republican nominating contest in Iowa. Christie had the support of just 2% of Republicans in a nationwide Reuters/Ipsos poll completed on Tuesday - the same level of support as former Representative Liz Cheney, who never declared herself a candidate.

Trump holds a big lead in the contest to be the party's nominee against President Joe Biden in November's election, according to the Reuters/Ipsos poll. The poll put him on 49%, ahead of former UN ambassador Nikki Haley at 12% and Florida Governor Ron DeSantis on 11%.