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Members of both parties in Congress said on Sunday the threat that prompted the weekend shuttering of more than 20 U.S. embassies and consulates in the Muslim world is credible and real, with one senator calling it the “most serious threat I’ve seen in a number of years.”

Sen. Saxby Chambliss of Georgia, the top Republican on the Senate Intelligence Committee, called it the “most serious threat I’ve seen in a number of years.”

“There’s an awful lot of chatter out there,” and it’s “very reminiscent of what we saw pre-9/11,”Mr. Chambliss told NBC’s “Meet the Press” on Sunday.

He’s not the only senator who weighed in on the subject on Sunday.

“Shutting down the embassies makes sense … ,” Sen. Lindsey Graham, South Carolina Republican, said on CNN’s “State of the Union. “The goal is to drive us out of the Mideast. Al Qaeda in the Arabian Peninsula, al Qaeda in Iraq, al-Nusra, all of them have one thing in common: They want to drive the West out of the Mideast and take over these Muslim countries and create an al-Qaeda-type religious entity in the place of what exists today. So this is an effort to terrorize us, to drive us out of the Mideast. And if we ever take the bait and try to come home and create ‘Fortress America,’ you’ll have another 9/11.”