The frequency of suspected USA drone attacks near the Pakistani-Afghan border has increased notably since Trump introduced his Afghanistan strategy in August.
In August, Trump said, "We can no longer be silent about Pakistan's safe havens for terrorist organizations, the Taliban, and other groups that pose a threat to the region and beyond".
Pakistan fired back at President TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for "serious case of amnesia" after testimony Skier Lindsey Vonn: I don't want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE on Monday, saying the US has given it "nothing but invective and mistrust" after Trump lashed out at the country and threatened to withhold aid in an early morning tweet.
Trump said that the USA had only gotten "lies" and "deceit" in return for the monetary aid it had provided. "They have to help".
Vice President Mike Pence, during a visit to Afghanistan just before Christmas, told USA troops that "Trump has put Pakistan on notice".
Kugelman noted Trump tweeted in October that relations with Pakistan were improving, when some experts suggested they were not.
In an early-morning post, he accused Islamabad of harboring terrorists.
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"We have made clear to Pakistan that while we desire continued partnership, we must see decisive action against terrorist groups operating on their territory".
Pakistan had no official comment on Monday, but Foreign Minister Khawaja Asif tweeted that his government was preparing a response that "will let the world know the truth".
U.S. Senator Rand Paul said on Twitter he would lead the charge in the Senate to end aid to Pakistan.
Since 2002, the United States has given Islamabad more than $33 billion in aid.
The US president's latest tweet follows in the aftermath of an increasingly tense back-and-forth between Washington and Islamabad after Trump announced the administration's latest national security strategy. And we make massive payments every year to Pakistan.
In December 2017, the Pentagon also informed the US Congress that it would take "unilateral steps" in areas of divergence with Pakistan while expanding cooperation between the two countries where their interests converge.
The remarks triggered a series of high-level diplomatic meetings in the U.S. and Pakistan, but Islamabad has given few signs of concessions.