Chris Christie announces US presidential campaign

The Republican governor of New Jersey, Chris Christie, has entered the race for the US presidency.

Mr Christie announced his decision to supporters via a conference call before a political rally at his hometown high school in Livingston, New Jersey, NBC News reports.

His decision is likely to be an unpopular one with voters: An NBC News/Wall Street Journal poll released last week found that 55 percent of Republican primary voters said they could not see themselves supporting Christie.