"We consider them to be destabilizing the region and also targeting USA personnel", State Department spokeswoman Heather Nauert told a regular news briefing.
Nauert made clear the $255 million was still blocked, and the Pentagon said the new action targets payments of so-called Coalition Support Funds that the US pays to Pakistan to reimburse it for its counterterrorism operations.
Mr. Trump's January 1 Twitter attack against Pakistan where he accused it of providing safe havens to terrorists appears to be helping boost already close ties between Pakistan and China, a report in the state-run Global Times said.
After a harshly worded New Year's Day tweet by President Trump accusing Pakistan of "deceit" and of harboring terrorists, State Department spokeswoman Heather Nauert confirmed Thursday that the USA will suspend most security assistance to Islamabad.
Some regional analysts question whether the Trump administration has a plan for how to move forward, or if the decision to cut funding was a reaction to recent comments from Pakistan's foreign minister, who accused Trump on Wednesday of lying about how much aid the US gives Pakistan. Although Pakistan "certainly has been helpful in some instances", she said, "they are not taking steps they need to take to fight terrorists".
Pakistan's support for these groups must end, Washington insists.
Since 2002, Pakistan has received over $13 billion in Coalition Support Funds (CSF) from the US.
In his first tweet of 2018, Trump said the U.S.
Trump's frustrations are shared by some USA lawmakers, who accused Pakistan of playing a double game by allowing militant groups sanctuary - which Islamabad denies - despite promising to crack down on them.
She added that Pakistan could review its cooperation with the U.S. if it is not appreciated.
USA security aid to Pakistan fell 62%-from $849 million in financial year 2012 to $322 million in financial year 2016. The $33 billion Trump referred to represents all US military and economic aid to Pakistan since 2002. In an article published on the website of Gatestone Institute, an worldwide policy council and think tank in New York, Islamabad-based journalist Kaswar Klasra has said that ISIS will continue to carry out attacks, itself or through other outfits such as Lashkar-i-Jhangvi, Jamaat-ul-Ahrar and the Taliban, unless Pakistan takes them to task, reported ANI.
Already frosty relations between the US and Pakistan -the two allies in the so-called war against terrorism- have further nosedived since President Trump assumed office in January past year, mainly due to a clash of interests in Afghanistan. Pressure from the USA also resulted in a buildup of Pakistani military presence along the border with Afghanistan.
There have been hints of a Pakistan aid cut by the Trump administration for months.
The military aid, known as foreign military financing, "promotes the development of Pakistan's long-term [counter-insurgency/counter-terrorism] capabilities and improves Pakistan's ability to participate in maritime security operations and counter-maritime piracy", according to the State Department.
Pakistan, which serves as a key transport route for supplies to USA forces in Afghanistan, denies harboring terrorists. Sadiq said on Friday that "what the U.S.is doing now is not good for its policy against terrorism and for a lasting peace in this region".
Pakistan is largely shrugging off the proposed US aid cuts but frets that Washington could take more drastic measures to deter what it sees as Pakistan's support for the Taliban.
Pakistan said the message was "completely incomprehensible" and at odds with the recent "trust-building" visits by Secretary of State Rex Tillerson and Defence Secretary James Mattis.
The US and others have long complained that Pakistan offered safe haven to the Afghan Taliban and their allies, the Haqqani Network, allowing them to carry out cross-border attacks in Afghanistan.