Sen. John KerryJohn KerryIn Europe, Biden seeks to reassert U.S. climate leadership Climate progressives launch first action against Biden amid growing frustration What US policymakers can glean from Iceland's clean energy evolution MORE (D-Mass.) said Sunday that he still had his suspicions about just how much the government of Pakistan knew about the whereabouts of Osama bin Laden before the terrorist leader was killed by U.S. troops. 

Kerry, the chairman of the Senate Foreign Relations Committee, said that while he doubted that high-ranking political or military leaders in Pakistan knew about bin Laden's location before last Sunday's U.S. assault against his compound in Abbottabad, he also found it hard to believe that no one knew about it.


"I think it's very, very hard to believe that at some level there wasn't somebody or some group in Pakistan who wasn't aware of this," Kerry said on CBS's "Face the Nation."

National Security Adviser Tom Donilon said Sunday that the Obama administration had no evidence that the government of Pakistan knew of bin Laden's whereabouts. Pakistan's ambassador to the U.S. similarly denied any such intelligence on Sunday. 

"If any member of the Pakistani government, the Pakistani military, or the Pakistani intelligence service knew where Osama bin Laden was, we would have taken action," said Husain Haqqani, Pakistan's top diplomat to the U.S., on ABC's "This Week." 

Kerry echoed Donilon to a degree, saying there was no evidence of knowledge of bin Laden's hiding place at the "highest level" of the Pakistani government. But the foreign relations chairman said he still had his doubts. 

"There are very serious questions and it's extraordinarily hard to believe that he survived there for five years … without some sort of support system or knowledge," Kerry said.