Sen. Bob Corker (R-Tenn.) on Monday asked Secretary of State Hillary Clinton for more details on how much cooperation the U.S. received from Pakistan in locating and carrying out the operation that resulted in the killing of Osama bin Laden earlier this week.

In his letter, Corker questioned whether Pakistan might have been holding back on information about bin Laden's whereabouts, given that he was so close to Pakistan's capital.

"As I understand from President Obama's speech last evening, the Pakistanis provided some cooperation in the operation that resulted in the death of Osama bin Laden," Corker wrote. "That said, the discovery that bin Laden was living in comfortable surroundings merely 35 miles from Islamabad calls into question whether or not the Pakistanis had knowledge that he was there and did not share that knowledge. The claim had been he was difficult to find because he was hiding in the mountains.

"I hope that in the coming days you will provide details as to the extent of the cooperation received from the Pakistanis and their role in the final operation," he added.