ISLAMABAD: US President Barack Obama's warning to Islamabad over suspected ties to militants will hurt efforts to stabilise Afghanistan and fuel anti-Americanism, the chairman of Pakistan's Senate Foreign Affairs Committee said on Friday.

Pakistan is seen as critical to bringing peace to 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 the United States, Afghanistan or Pakistan,” Salim Saifullah told Reuters. “There will be pressure on the (Pakistan) government to get out of this war,” he said, referring to the US war on militancy.

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

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

Saifullah said Washington's public criticism of Pakistan was counter-productive and would only create tensions between allies that would play into the hands of militant groups.

“War in Afghanistan is passing through a critical phase, evolutionary phase, at this stage muddying water is not appropriate,” he said.

“This is exactly what the militants want. They are playing to their tune. This is adding strength to them.”