BAGHDAD — Iraq's parliament ended weeks of debate Sunday and passed a long-delayed law paving the way for the planned January election to go forward, sidestepping a crisis that could have delayed the U.S. troop withdrawal.

The decision appeared to resolve a key sticking point — who will be allowed to vote in the disputed, oil-rich city of Kirkuk. The issue had threatened to delay Iraq's key parliamentary elections, which in turn would affect how quickly American combat forces could leave the country.

In a sign of how intensely Washington was following the debate, U.S. Ambassador Christopher Hill could be seen shuttling between various political factions before the law's passage. President Barack Obama, speaking at the White House, welcomed the new legislation.

"This is an important milestone as the Iraqi people continue to take responsibility for their future. I want to congratulate Iraq's leaders for reaching this agreement," Obama said. "The United States will continue to stand with Iraq as a strong partner and as a friend."

Iraq's prime minister, Nouri al-Maliki, in a statement posted on his Web site, hailed the election law's passage as a "historic victory of the will of the people," and described it as a strong response to the people who are trying to undermine the country's security.

The U.S. ambassador, speaking to reporters after the vote, said the American troop drawdown will proceed as scheduled. Military commanders have said the U.S. troop withdrawal would start in earnest about 60 days after the vote, the idea being that the country would be on stable footing by then.

"What is important is that with the election law, we are very much on schedule for the drawdown," Hill said.

Under the president's plan, all U.S. combat troops will be out of the country by the end of August 2010, leaving about 50,000 trainers and support troops, who in turn would leave by the end of 2011.

It was not clear exactly when the election would be held — Jan. 16 as originally planned or a later date in January. The head of the Independent High Electoral Commission, Faraj al-Haidari, told The Associated Press that he expected the vote to be held within a week of Jan. 16.

Deputy Parliament Speaker, Khalid al-Attiyah said it would likely be held January 21 or 23. The Iraqi constitution mandates that the vote takes place in January, but does not specify which day.

Once the legislation is approved by the president and his two vice presidents, the election commission will decide how many days are needed to hold the vote, al-Haidari said. Then the commission will send a letter to parliament and to the prime minister to inform them of their decision.