Chris Christie: “Is the greatest and broadest public health epidemic of our lifetime.”

The selection of Senator J.D. Vance of Ohio as Mr. Trump's running mate doubles down on the portion of the party already completely devoted to him rather than reaches out to the broader party and beyond.

What poses a national security risk is the possibility that he could be president of the United States again.

It makes this debate really crucial. It's an amazing timing by him, because it is a race for second in Iowa.

It's clear to me tonight that there isn't a path for me to win the nomination, which is why I'm suspending my campaign tonight for the United States.