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Can the GOP really sink Trump?

Can anyone inside the Republican Party — via negative TV ads or a scorched-earth campaign — stop Trump?

Republican presidential candidate Donald Trump speaks during a campaign rally at the Macon Centreplex, Nov. 30, 2015, in Macon, Ga. (Photo by Branden Camp/AP)
Republican presidential candidate Donald Trump speaks during a campaign rally at the Macon Centreplex, Nov. 30, 2015, in Macon, Ga.AP

Chuck Todd

Chuck Todd is NBC News' chief political analyst and the former moderator of "Meet The Press."

Mark Murray