"The world has changed," Mr. King said on NBC's "Meet the Press" program on Sunday.
By Friday afternoon, Mr. Paul's campaign had canceled his scheduled appearance on Sunday's "Meet the Press" program.
The previous night, the leaders of most parties had been interviewed in succession on Israel's "Meet the Press" program.
(Ms. Rosen, who had been scheduled to be on NBC's "Meet the Press" program on Sunday, decided to cancel).
"This, to me, I'm very uncomfortable with," Mr. Booker said on NBC's "Meet the Press" program.
"It will ban the sale, the transfer, the importation, and the possession" of assault weapons, she said on NBC's "Meet the Press" program on Sunday.
Ten hours later, they will reconvene, this time on the set of NBC's "Meet the Press" program for another debate.
Mr. Gingrich disputed Mr. Santorum's claim of overwhelming support among evangelicals, saying on NBC's "Meet the Press" program that he remained a favorite among "Christian conservatives and social conservatives" in South Carolina.
Mr. McCain said on NBC's "Meet the Press" program that the United States should increase its role in North Atlantic Treaty Organization air attacks against Libya, saying that only six NATO nations were engaged in the conflict.
On NBC's "Meet the Press" program, General Petraeus said that a review currently under way by the Pentagon, which is to include a poll of military attitudes on the change, "is very important to this overall process".
