Michael DuHaime, a senior adviser to Chris Christie, went on MSNBC Wednesday to talk about how the GOP could take down Donald Trump. | AP Photo Chris Christie adviser went on MSNBC to talk about how to stop Trump

Just two days before Chris Christie made a surprise endorsement of Donald Trump, one of his closest political aides appeared on MSNBC for an entire segment on how to stop Trump from running away with the Republican presidential nomination.

Michael DuHaime, a senior adviser to the New Jersey governor, appeared on MSNBC’s “MTP Daily” on Wednesday with Brad Todd, a former adviser to Louisiana Gov. Bobby Jindal’s super PAC, to reflect on their campaigns and what they could have done to stop the New York billionaire.

DuHaime said that a lot of campaigns missed the chance to take down Trump because the campaigns were “designed for our candidates to win not necessarily for any other candidate to lose."

“We have so many people now coming to give us advice about how to stop Trump. No one was saying, here’s the best way Chris Christie can win or Bobby Jindal can win. People were coming to us saying here’s the best way Donald Trump can lose,” DuHaime said.

“If everybody wanted to stop Trump, they should have gotten behind one person not sit on the sidelines and carp that we should beat Trump,” he continued.

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But he offered some advice to the candidates still in the field: “Somebody does need to probably show that they can take on Trump.”

Rubio needed to show he could give more than just “really good” 60 second speeches, DuHaime added.

Asked if Christie had any plans to endorse someone soon, DuHaime said the governor was "waiting and watching."

“I think he’s waiting, he hasn’t endorsed anybody at this point, I think he’s waiting and watching like I think other people are,” he said.