McCain was not satisfied, saying Assad's killing of civilians remained unchecked.
"Come on. ... The fact is that he was about to be toppled a year ago, or over a year ago. Then Hezbollah came in. Then the Russians stepped up their effort. Then the Iranian Revolutionary Guard intervened in what you call a, quote, 'civil war,' and he turned the tide. And he continues to maintain his position of power and slaughtering innocent Syrian civilians. And you are relying on a Geneva conference, right?"
The prospects for an international peace conference in Geneva to end the war are unclear.
The United States, Russia and the United Nations have been trying for months to bring the Syrian government and the opposition together in Geneva to attempt to negotiate a political resolution to the conflict. Efforts renewed in earnest last month to organize the conference, but the Syrian opposition remains deeply divided over whether to attend, while the government refuses to sit down with the armed opposition.
Assad told the Arab League-U.N. envoy Wednesday that foreign support for the armed opposition must end if any political solution to the country's conflict is to succeed.
The Britain-based Syrian Observatory for Human Rights increased its estimate of the death toll of the war, now in its third year. It said more than 120,000 people have been killed since the start of the conflict, up from the previous estimate of 100,000. The new estimate said more than 61,000 of the dead were civilians.
"The problem itself is tragic ... and we want to help them," Ford said in one exchange with Sen. Bob Corker, the top Republican on the committee. "But ultimately, Senator, Syrians must fix this problem, and ultimately, Senator, it's going to require them to sit down at a table. The sooner they start, the better. But in the meantime, we will keep helping the opposition, Senator."
Corker, who has long been critical of the slow pace of aid to Syria, said he thinks the U.S. assistance to Syrian opposition has been an "embarrassment."
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Associated Press Writers Pauline Jelinek and Deb Riechmann in Washington contributed to this report.