On NPR's "Diane Rehm Show," Sen. Joe Biden, D-Del., the chairman of the Senate Foreign Relations Committee, called Obama "naïve" and implied he wasn't experienced enough for the presidency. "Having talking points on foreign policy doesn't get you there," Biden said of Obama.
On the other hand, one of Obama's chief Senate supporters -- fellow Illinoisan Dick Durbin, the Senate Democratic Whip -- applauded Obama's speech, saying the freshman's remarks were entirely appropriate.
"I think he's thrown down the challenge to Musharraf and I think it's one he can't ignore," said Durbin, who said he hadn't heard about Obama's remarks about nuclear weapons.
Clinton was holding a press conference to discuss a bill she had introduced with Sen. John Kerry, D-Mass., requiring the Pentagon to brief Congress on plans for U.S. troop withdrawal from Iraq. Having asked for such a briefing in May, Clinton received a letter from Undersecretary of Defense Eric Edelman in July suggesting that such a request aided enemy propaganda efforts, a letter Defense Secretary Robert Gates distanced himself from.
Gates also promised the Pentagon would provide a classified briefing for the Senate Armed Services Committee on withdrawal planning, which took place Thursday morning. A Senate source told ABC News that Clinton "humbled" Edelman during the briefing for his letter to her.
"You didn't hear that from me," Clinton said laughing, when asked by ABC News about the reported dressing down of the undersecretary. "I would rather not comment because I consider what happens in a classified briefing to be classified."
A senior defense official told ABC News that the briefing contained "a couple of snarky kind of questions such as requesting that Congress be briefed regularly on withdrawal planning."
Asked if Clinton "humbled" Edelman, the official said, "I didn't get that sense, most of the questions at the briefing stayed on substance. There were perhaps a couple of sarcastic kind of questions, a sarcastic line of inquiry. Our guys were very positive and provided information helpful in understanding what it is we're doing."
Clinton and Obama have been engaged in a heated to-and-fro about foreign policy since a debate last week when he said as president he would readily meet with leaders of nations hostile to the U.S., remarks she called "irresponsible and frankly naïve."
Obama responded by implying her views on foreign policy constituted "Bush-Cheney Lite."
Luis Martinez at the Pentagon contributed to this report