Mitch McCann: US correspondent on former New Jersey Governor Chris Christie announcing 2024 presidential campaign - Heather du Plessis-Allan Drive

Former New Jersey Governor Chris Christie kicked off his 2024 presidential campaign by slamming an ally-turned-rival.

Chris Christie called former president Donald Trump a 'lonely, self-consumed mirror hog', going against his previous support.

US correspondent Mitch McCann says Chris Christie is the latest Republican contender for president and his eagerness to attack Trump is a stark contrast to others who ignored the former leader.

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