From the story here:
The decision drew a sharply worded critique from Washington Post conservative columnist Jennifer Rubin, who quickly penned a rebuke of “Christie’s despicable endorsement.”
Other GOP figures described the endorsement as a big move coming ahead of Super Tuesday next week, when Trump seems poised to increase his delegate lead.
“This is a huge step for Trump and will impact Super Tuesday [big] time,” 2012 presidential candidate Newt Gingrich said on Twitter.
“This Chris Christie endorsement of Trump is real signal to GOP establishment that they had better begin thinking about Trump as the future.”