Christie, despite criticizing Trump on the campaign trail for refusing to participate in the Fox News debate and for his proposed ban on Muslims, endorsed the real estate mogul last week.
Whitman, CEO of Hewlett-Packard called Christie's endorsement an "astonishing display of political opportunism" and she called for Christie donors and supporters to reject Trump.
Here's her full statement, according to NBC:
Chris Christie's endorsement of Donald Trump is an astonishing display of political opportunism. Donald Trump is unfit to be President. He is a dishonest demagogue who plays to our worst fears. Trump would take America on a dangerous journey. Christie knows all that and indicated as much many times publicly. The Governor is mistaken if he believes he can now count on my support, and I call on Christie's donors and supporters to reject the Governor and Donald Trump outright. I believe they will. For some of us, principle and country still matter.