Washington ? The White House, backing away from President Barack Obama’s “it’s-all-on-the-table” approach initially advocated, prepared to get louder and more involved in the details of a health care overhaul that officials once were content to leave to Congress, administration officials said Saturday.

The White House’s attention increases as Congress turns to a priority that officials watched in recent weeks drift off what has otherwise been a precise pathway. Even with an Obama-imposed August deadline, many administration aides weren’t sure just how much they would be able to accomplish before Congress left for the summer, and Obama has turned to his grassroots supporters to pressure Congress to find a solution.

Covering 50 million uninsured Americans could cost as much as $1.5 trillion over a decade, but Obama has cited the crippling impact on the economy of soaring health care costs and society’s long-standing need to resolve the problem.