The remarks by the official came days after the Trump administration suspended approximately USD 2 billion in security assistance to Pakistan, resulting in an outrage from Islamabad.
President Donald Trump in a New Year's Day tweet accused the country of giving nothing to the US but "lies and deceit" and providing "safe haven" to terrorists in return for USD 33 billion aid over the last 15 years.
The US is committed to not allowing either Pakistan or Afghanistan to become a safe haven for terrorists from where they can attack America and its allies, said the senior Trump administration official on condition of anonymity.
"These sanctuaries really threaten stability in the region and they continue to fuel the overall terrorism problem that we're facing," the official said.
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The "previous administrations have tried to exercise what they might call strategic patience or offering inducements like Kerry-Lugar-Berman bill which gave billions of dollars to Pakistan", the official said, adding none of it has worked so far.
Terrorists continue to operate freely inside Pakistan and there is a relationship between terrorist organisations and the establishment, the official said.
"This administration believes it's time to try something different. We simply can't ignore the sanctuaries if we're going to make progress in Afghanistan," the official said, adding that "the president has been clear about his commitment to stabilising Afghanistan".
In August, while unveiling his new South Asia strategy, Trump had accused Pakistan of giving "safe haven to agents of chaos, violence, and terror," and said the time had come "for Pakistan to demonstrate its commitment to civilisation, order, and to peace".
The official said the Trump's new policy was not about looking at Pakistan through the lens of Afghanistan, but it was about looking at the region and the future of the US.
"So, I wouldn't classify it is looking at Pakistan through the Afghanistan lens. I think that's too narrow of a viewpoint. I think this is about the region and the future of the region. And the fact that these continued sanctuaries really threaten stability in the region and they continue to fuel the overall terrorism problem that we're facing," the official added.