The US Congress on 6 May initiated a move to block $450 million in aid to Pakistan for failing to "demonstrate its commitment" and taking action against the Haqqani terror network.
The provision in the National Defence Authorisation Act (NDAA) for the fiscal year 2017, if passed by the Congress, would not allow the US government to waive this condition in "national interest".
According to the NDAA 2017 - as passed by the House Armed Services Committee last week - of the total amount of reimbursement and support authorised for Pakistan during the period beginning on 1 October, 2016, and ending on 31 December, 2017, $450 million would not be eligible for a national security waiver unless the secretary of defence certifies that Pakistan continues to conduct military operations against the Haqqani network in North Waziristan.
The defence secretary also needs to certify that Pakistan is demonstrating a commitment to prevent the Haqqani Network from using North Waziristan as a safe haven and is actively coordinating with Afghanistan to restrict the movement of militants, including the Haqqani network, along the Pakistan-Afghanistan border.
There is similar certification requirement in the current fiscal 2016 ending on September 31, 2016, but the amount is $300 million.
Defence secretary has not been able to give necessary certification for the release of such a fund to Pakistan so far.
The House Armed Services Committee says that it will continue to review the reimbursements made to Pakistan and how it comforts with the future of US policy, including key counterterrorism and security objectives, in the region.
It also asked the secretary of defence to notify the congressional defence committees prior to making any reimbursement to Pakistan for any logistical, military or other support.
It further extends the requirement for the secretary of defense to certify, prior to making any reimbursement to Pakistan, that Pakistan is maintaining security along the Ground Lines of Communications, taking demonstrable steps to support counterterrorism operations, disrupting cross border attacks and countering the threat of improvised explosive devices.
The move comes days after the US told Pakistan to put forward its national funds to buy eight F-16s worth $700 million after some top Senators put a hold on the use of American tax payers' money to partially finance them.