The United States accused Pakistan on Tuesday of playing a "double game" on fighting terrorism and warned Islamabad it would have to do more if it wanted to maintain U.S. aid.

"They can do more to stop terrorism and we want them to do that," White House spokeswoman Sarah Sanders told reporters.

The White House said it would likely announce actions to pressure Pakistan within days, shortly after U.S. Ambassador Nikki Haley said at the United Nations that Washington would withhold $255 million in assistance to Pakistan.