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“We need our allies. I appreciate that they’ve come in. But we’re the heart of NATO, and it’s not exactly as if we took the ball and gave it to NATO,” Mr. Lieberman said. “We’re still NATO, and I think some of our assets that we removed … ought to go back into the fight.”

He said that “every time we pull back, it says to Gadhafi that he can tough this out. And I want him to feel that we’re just going to squeeze and squeeze until he decides it is time to go because that’s the only end that will be meaningful here.”

Mr. Lieberman and Mr. McCain appeared on CNN’s “State of the Union” broadcast on Sunday; Mr. Graham’s remarks, aired on the same show, were taped on Friday.