Pakistan says Obama pressure on militants hurts Afghanistan

President Barack Obama's warning to Islamabad over suspected ties to militants will only fuel anti-Americanism and make it harder for Pakistan to support U.S. efforts to stabilise Afghanistan, a senior senator said on Friday.

Pakistan is seen as critical to bringing peace to neighbouring Afghanistan, but the United States has failed to persuade it to go after militant groups it says cross the border to attack Western forces in Afghanistan.

"This is not helping either the United States, Afghanistan or Pakistan," Salim Saifullah, chairman of the Senate Foreign Affairs Committee, told Reuters.

"There will be pressure on the (Pakistan) government to get out of this war," he said, referring to the U.S. war on militancy.

Obama warned Pakistan on Thursday that its ties with "unsavory characters" had put relations with the United States at risk, as he ratcheted up pressure on Islamabad to cut links with militants mounting attacks in Afghanistan.

His comments are likely to deepen a crisis in the strategic alliance between the United States and Pakistan.

Obama accused Pakistan's leaders of "hedging their bets" on Afghanistan's future, but stopped short of threatening to cut off U.S. aid, despite calls from lawmakers for a tougher line over accusations that Pakistani intelligence supported strikes on U.S. targets in Afghanistan.

Pakistan says it has sacrificed more than any other nation that joined America's global "war on terror" after the Sept. 11, 2001 attacks on the United States, losing 10,000 soldiers and security forces, and 30,000 civilians.

Pakistan is often accused of playing a double game, vowing to help the United States fight some militant groups while using others as proxies in Afghanistan.

Ties were heavily damaged after U.S. special forces launched a secret raid that killed Osama bin Laden in Pakistan in May, which Islamabad saw as a violation of its sovereignty.