Benjamin Rhodes, deputy national security adviser for strategic communications, said that Pakistan had been an important ally in the battle against militant groups, and that Pakistani soldiers and intelligence officials had worked alongside the United States to capture or kill Qaeda and Taliban leaders.

Still, he said that the “status quo is not acceptable,” and that the havens for militants in Pakistan “pose an intolerable threat” that Pakistan must do more to address.

“The Pakistani government — and Pakistan’s military and intelligence services — must continue their strategic shift against violent extremist groups within their borders,” he said. American military support to Pakistan would continue, he said.

Several Congressional officials said that despite repeated requests over the years for information about Pakistani support for militant groups, they usually receive vague and inconclusive briefings from the Pentagon and C.I.A.