Trump unloaded on the former presidential candidate and friend-turned-foe after an appearance critical of the president on television.

President Donald Trump threatened to open an investigation targeting Chris Christie over \

The president tore into one-time friend Chris Christie, who had criticized him during a TV appearance earlier in the day.

Trump unloaded on the former presidential candidate and friend-turned-foe after an appearance critical of the president on television.

President Donald Trump is threatening to investigate former New Jersey Gov. Chris Christie, as he continues to use the Justice Department to punish political adversaries.