Nikki Haley. Pic/AFP

US President Donald Trump will go all out to cut off aid to Pakistan if it continues to back terrorists, US Permanent Representative Nikki Haley has warned. "The President is willing to go to great lengths to stop all funding for Pakistan if they continue to harbour terrorism," she told reporters here on Tuesday. "The administration is withholding $255 million in assistance to Pakistan" because its "double game" of working with US at times and with terrorists at others "is not acceptable to this administration" she said.