Pakistan was also upset at the recent USA arms deal with India signed during the visit of Indian Prime Minister Narendra Modi to Washington.
In this photo released by by Pakistan's Press Information Department, visiting U.S. Senator John McCain, left, shakes hand with Pakistani Prime Minister Nawaz Sharif prior to their meeting in Islamabad, Pakistan, Monday, July 3, 2017.
The delegation met Adviser on Foreign Affairs Sartaj Aziz and discussed with him important bilateral issues, including terrorism, Pakistan's relations with India and Afghanistan and regional peace.
Senator McCain said that the United States policy regarding the Kashmir issue hasn't changed, adding that the U.S. wants an end to violence in the territory.
Sartaj Aziz said that strategic partnership between Pakistan and USA was essential to bring peace and stability to the region and beyond. Other members of the USA delegation were Lindsey Graham, Sheldon Whitehouse, Elizabeth Warren and David Perdue.
Meanwhile, Pakistan's ministry of foreign affairs said in a statement that Pakistan remained committed to supporting efforts for lasting peace and stability in Afghanistan.
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The US senators also praised the economic turnaround, as manifested by investors' interest and confidence in Pakistan.
He added it was not necessary for them to agree with US' decision.
Mr Aziz raised concern over the gross human rights violations by Indian security forces in held Kashmir and global community's silence over the reign of terror unleashed by India on innocent and unarmed Kashmiris.
Earlier, after the United States declared Hizbul Mujahideen militant Syed Salahuddin as a global terrorist, Pakistan has said it would continue to extend political, diplomatic and moral support to Kashmiri separatists for what it called their struggle for their right to self-determination and for the peaceful settlement of the Kashmir dispute as per the UN Security Council resolutions.
The senators appreciated the contribution and sacrifices made by Pakistan and the successes achieved in the fight against terrorism.
The Reuters news agency quoted two USA officials last month as saying the administration was considering hardening its attitude toward Islamabad because of the ease with which Pakistan-based militants have been able to launch attacks across the border in Afghanistan.