WASHINGTON -- It is more important that health-care legislation inject stiff competition among insurance plans than it is for Congress to create a pure government-run option, White House Chief of Staff Rahm Emanuel said.

"The goal is to have a means and a mechanism to keep the private insurers honest," he said in an interview. "The goal is non-negotiable; the path is" negotiable.

President Barack Obama has campaigned vigorously for a full public option. But he's also said that he won't draw a "line in the sand" over this point. On Tuesday, the White House issued a statement reiterating his support for a public plan.

"I am pleased by the progress we're making on health care reform and still believe, as I've said before, that one of the best ways to bring down costs, provide more choices, and assure quality is a public option that will force the insurance companies to compete and keep them honest," the president said in the statement. "I look forward to a final product that achieves these very important goals."

The jockeying over the public plan came as the Senate Finance Committee pushed for a bipartisan deal. To help pay for the package, the committee planned to announce an agreement Wednesday with hospitals and the White House for $155 billion over a decade in reductions to Medicare and charity-care payments for hospitals, according to a person familiar with the agreement. That will help pay for the legislation, expected to cost at least $1 trillion over 10 years.