Sen. Marco Rubio, R-Fla., explained on the Mark Levin show Monday night that he was concerned about President Obama’s tepid reaction to terror threats in the Middle East.

Levin pointed out that he found it odd that President Obama went golfing on Saturday even though there were serious threats against American embassies in the Middle East.

“Maybe he had a phone in the golf cart, I don’t know,” Rubio said, adding that he had no reason to believe that the president wasn’t taking the threats seriously.

Rubio pointed out, however, that he found it puzzling that Obama refused to call the struggle a “war on terror.”

“I have a problem with that because we need to have that mentality — that, in fact, that this is a battle we’re engaged, it’s going to last a while,” Rubio said.

Rubio reminded Levin that the al Qaeda threat was still very real and should be taken seriously.

“These are radical crazies who are looking for ways to kill innocents,” he declared.

Levin listeners might have been surprised that Rubio was a guest on the show — after several weeks of Levin blasting the Florida senator for his work on the Senate immigration bill.

“You sound a little glum. Are you all right?” Levin asked after Rubio first came on the air.

“No. I’m doing well, I’m just concerned about the news and national security issues and all of that, but I appreciate the chance to come on the air with you,” Rubio replied.

“Well, let’s talk about that, I tell you one thing we’re not going to talk about, and that’s the ‘I’ word,” Levin chuckled. “I’m just not in the mood for that.”