Christie, who dropped out of the race for the Republican presidential nomination this month, surprised the political world by backing the brash billionaire Friday, calling Trump a "good friend."
Hogan and Christie are close friends, and the Maryland governor said he missed several phone calls from Christie in the hours leading up to the Trump endorsement.
"He left me a message saying, 'I want to talk to you,'" Hogan said after transportation event in Prince Fredrick. "He called back again saying 'I want to talk to you about Trump, and the sooner you talk to me, the better.' And about a half an hour later, there was an announcement. So I didn't get a chance to talk to him about it."
Asked whether he would have tried to talk his friend out of endorsing Trump, Hogan was silent for a few seconds.
"I don't have any comment about that," he said. "You got me speechless on that one."
After campaigning for Christie at least three times in New Hampshire and spinning for him after a debate, Hogan now said "I'm not endorsing anybody."
"I had a special relationship with Governor Christie because he had helped me so much in my race," Hogan said. "I felt like helping him when he was in the race, but at this point, I not only haven't endorsed anybody, I haven't decided who I am going to support."