It's now or never for the #NeverTrump campaign and the Super PAC Delegates Unbound to stop Donald Trump from obtaining the official nod as the GOP presidential candidate.

Heading into next week's GOP convention in Cleveland, one of the staunch supporters of Delegates Unbound is a former New Hampshire U.S. senator and current delegate, Gordon Humphrey.

Humphrey, previously a John Kasich supporter, said the Delegates Unbound organization is about removing a candidate who is not fit for the presidency. "Trump is a sick sociopath. He has no conscience. No feelings of guilt, remorse, empathy or embarrassment. He has never apologized to Carly [Fiorina], the disabled reporter or Senator McCain on the horrible things he said about them," said Humphrey, who served two terms in the Senate. "He has severe personality disorders and is not fit to be president."



The Trump campaign did not immediately respond to a request for comment from CNBC.



Working full-time to "educate" the delegates to stand up for their rights of being free and able to vote for whomever they want is Humphrey's fundamental goal. "Delegates were elected to choose the candidate that is a fit to be president. They were not elected to be a rubber stamp," he said.