WASHINGTON (CNN) - President Barack Obama will address the contentious issue of health-care reform in a speech before a joint session of Congress on September 9, multiple Democratic sources told CNN Wednesday.
"The president is considering ... laying out a more specific vision" of health-care reform, said one administration official, speaking on the condition of anonymity.
So far, Obama has outlined broad principles for what he would like in health-care reform, but he has left most details to leaders in Congress. Now, White House aides say, the dynamic has changed.
"We're entering a new season," senior adviser David Axelrod said. "It's time to synthesize and harmonize these strands and get this done."
The new phase is being "driven in part by the actions of some in the GOP, including Senators Grassley and Enzi," the administration official noted.
The official added that the White House believes those actions indicate the two key Republicans - Chuck Grassley of Iowa and Mike Enzi of Wyoming, who have been part of a bipartisan group negotiating a health-care bill - "are essentially walking away from the table."
The official said that "now is the time to begin to pull together the various strands and solutions from the four bills that have been marked up and other proposals. ... Basically all the cards are on the table."
As momentum for health-care reform has slowed, Obama has come under growing pressure from liberal activists and leading congressional Democrats to provide more specifics.
"I think the president needs to step forward," Sen. Sherrod Brown, D-Ohio, said Tuesday. "Be more specific, more aggressively fight for a strong health-reform bill with a strong public option. I think he's going to do that."
Obama will host House Speaker Nancy Pelosi and Senate Majority Leader Harry Reid at the White House next Tuesday afternoon to discuss the speech, two officials added.
The president called Reid on Wednesday morning to inform him about the speech, according to a Democratic leadership aide.
–CNN's Ted Barrett, Dana Bash, Ed Henry, Gloria Borger, Brianna Keilar, and Elaine Quijano contributed to this report