New Jersey Gov. Chris Christie on Tuesday said that the three Republican senators who are running against him for the GOP presidential nomination do not have enough experience on national security issues to be president.

In an appearance on MSNBC's Morning Joe, Christie said that Sens. Marco Rubio (R-Fla.) and Ted Cruz (R-Texas) are too inexperienced on national security issues to govern. He added that Cruz and Kentucky Sen. Rand Paul's votes to curtail national security surveillance programs had made the country less safe.

He noted that Cruz and Paul both voted to curtail the National Security Agency's metadata collection program. Asked whether he thought Cruz has made country less safe, Christie responded: "Sure he has."

"He went for the easy political vote at a time when it looked like a popular thing to do," Christie said. Asked whether Rubio has the experience to be president, Christie answered, "He doesn't have my experience."

He added that the statement applies to "Ted Cruz and others in this race who have no experience in governing."

"I'm talking about anybody who doesn't have the requisite experience to make the tough decisions that need to be made as president," Christie said.

Christie has struggled to gain traction in swing state and national polls, but this week received several key endorsements in New Hampshire, where he has spent the most time as a candidate.

On the campaign trail, he has used his experience as a former U.S. Attorney in the Bush administration after the 9/11 terror attacks to bolster his national security credentials. Christie noted that he is the only candidate whose job it was to use intelligence and law enforcement tools to prosecute terrorism.

"When it wasn't fashionable ... I was fighting that fight, I understand based on my experience as a U.S. Attorney that this is necessary to protect the homeland," Christie said. "I didn't get briefed in some basement in Capitol Hill."