"It would be terrible but the war would be over here (there), wouldn't be here," Graham said with a gesture with his fingers. "It would be bad for the Korean Peninsula. It would be bad for China.

It would be bad for Japan, be bad for South Korea. It would be the end of North Korea. But what it would not do is hit America and the only way it could ever come to America is with a missile."

Asked if he would support a preemptive strike on the North, Graham said, "If that's what it would take."

Graham also said the US is "on a collision course" with the North.

The senator said North Korea was a topic when he had lunch with President Donald Trump.

"I said, 'Do you want on your resume that during your presidency the North Koreans developed a missile that could hit the American homeland with a nuclear weapon on top of it?' And he said, 'Absolutely not,'" Graham said.

Graham said he recommended Trump tell China that if Beijing doesn't stop Pyongyang from building a missile capable of striking America, the US "will do everything, including diplomatic sanctions and military strike to stop the missile program."

"Look at it this way. Do you really want North Korea to have a missile that can hit California with a nuclear weapon on top of it.

Twenty years ago, North Korea really didn't have any nuclear weapons. Every Republican and every Democrat has screwed up North Korea. They're close to getting a missile to hit the homeland. Now is the time to stop," he said. (Yonhap)