Asked about Dempsey's comments, White House spokesman Jay Carney said Obama always asks his military commanders for options "and that is true in an arena like Syria." He said the president is constantly reviewing U.S. options in Syria
"There are a whole range of options that are out there," Navy Adm. James Winnefeld, vice chairman of the Joint Chiefs, said of the planning for military action in Syria. "We are ready to act if we're called on to act."
McCain later told a group of reporters he plans to block Dempsey's confirmation, saying he was dissatisfied with the answers to the questions Dempsey was asked about Syria.
I want to see him answer the question," McCain said. "Hello!"
Seeking a compromise, Sen. Carl Levin, a Democrat and the committee chairman, asked Dempsey to provide the panel by early next week with an unclassified list of options and the general's assessment of the pros and cons of each. Levin made clear he is not asking Dempsey to share his personal opinion on whether or not to use force in Syria. Dempsey agreed to provide the list.
Levin said he hoped the assessment from Dempsey would give McCain "greater reassurance."
"I don't know if it will, but that was the way in which I think a legitimate issue needs to be addressed," Levin told reporters
Dempsey acknowledged in response to a question from Sen. Lindsey Graham, a Republican, that Assad's forces have the upper hand in Syria.
"Currently the tide seems to have shifted in his favor," the general said.
The Armed Services Committee is considering Dempsey's and Winnefeld's nominations for a second term. The Democratic-led committee is all but certain to approve the reappointments.
Leading senators including Levin and McCain, have been pressing Obama to take a more forceful approach to defeat Assad's forces. While the administration has authorized lethal aid to rebel forces battling Assad's troops, it isn't trying to enforce a no-fly zone in which Syria's combat aircraft would be barred from flying, or otherwise intervene militarily to halt the war.
To avoid getting drawn deeper into Syria's civil war, administration officials have pointed to the U.S.-led invasion of Iraq in 2003 as an example of what can go wrong when America's military becomes involved in Middle East conflicts.
"We've rushed to war in this region in the past. We're not going to do it here," Obama's chief of staff, Denis McDonough, said Sunday on CBS television's "Face the Nation."
During his exchange with McCain, Dempsey said "situations can be made worse by the introduction of military force" without first understanding how the country would continue to govern and ensuring that government institutions don't fail.
Dempsey's first term as chairman has been a turbulent one with the military drawing down from lengthy wars in Iraq and Afghanistan. At the same time, he has had to grapple with billions of dollars in budget cuts that have threatened military readiness, the epidemic of sexual assaults in the ranks, the crisis in Syria, and most recently unrest in Egypt.
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Associated Press writers Robert Burns and Bradley Klapper contributed to this report.