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Story highlights

"It's like being shot or poisoned," the South Carolina Republican said. "What does it really matter?"

Graham was asked which of the two presidential candidates he preferred Thursday after going on a rant about both of them at a Capitol Hill press conference

(CNN) —  

Sen. Lindsey Graham did not mince words Thursday about choosing between Donald Trump or Sen. Ted Cruz, comparing it to a choice between poisoning or being shot.

“It’s like being shot or poisoned,” the South Carolina Republican said. “What does it really matter?”

Graham was asked which of the two presidential candidates he preferred Thursday after going on a rant about both of them at a Capitol Hill press conference. He attached the real estate mogul and the Texas senator to Democratic presidential hopeful Vermont Sen. Bernie Sanders.

“Donald Trump I think is the most unprepared person I’ve ever met to be commander in chief. And when it comes to Sen. Cruz, he’s exhibited behavior in his time in the Senate that make it impossible for me to believe that he could bring this country together,” Graham said.

RELATED: The Ted Cruz pile-on

He added that when it comes to the three men: “If the past is any indication of the future … I think America would be in trouble if any of them got to be president of the United States.”

Graham dodged on whether he would support Trump if he were to end up as the party nominee.

“I can’t have it both ways,” Graham said. “I’m a Republican … he’s doing far better in the primary than I did.”

But the former presidential candidate, who has endorsed former Florida Gov. Jeb Bush, said the candidates’ positions on national security should matter.

“When Donald Trump speaks about foreign policy, it scares the hell out of me,” Graham said.