ISLAMABAD, PAKISTAN, AUG. 3 -- Pakistan's foreign minister today rejected U.S. demands that his country open its secret nuclear program to international inspection, despite the risk of a suspension of American aid.

Responding to questions during Senate proceedings, Foreign Minister Sahabzada Yaqub Khan said the furor in the U.S. Congress over Pakistan's nuclear program marks "a low in the long-standing and supportive friendship" between the two nations.

Khan's comments coincided with a visit by Michael Armacost, U.S. undersecretary of state for political affairs. Armacost was to meet tonight with Pakistani President Mohammed Zia ul-Haq.

A western diplomatic source said that during talks Sunday Armacost pressed for inspection of the uranium enrichment facility at Kahuta, 20 miles southeast of Islamabad. Such inspection would ensure enrichment stayed within acceptable levels for peaceful research and power generation.

"We reject suggestions that Pakistan accept any unilateral restraints on its nuclear program," Khan told the Senate. "Such limitations are an affront to our self-respect, harmful to our national interests and do not advance the prospect of nonproliferation either."

Pakistan consistently has refused to open Kahuta to international inspection or sign the Nuclear Non-Proliferation Treaty before its neighbor and archrival, India, signs the accord.

Islamabad has not changed its position despite the July 10 arrest in Philadelphia of a Pakistani native for allegedly trying to export illegally 25 tons of alloy that can be used in making nuclear weapons.

{In Washington, the House of Representatives yesterday adopted without dissent a nonbinding resolution to cut off U.S. military aid to Pakistan unless Pakistan can provide "verifiable" evidence that it is not seeking to produce weapons-grade nuclear material or attempting to acquire nuclear technology in the U.S.

{Rep. Mel Levine (D-Calif.), the sponsor of the resolution, accused Pakistan of "arrogant violations of our laws and trust" by its "obvious and repeated attempts to acquire a nuclear weapons capability." Last week the Senate adopted without dissent an identical resolution.}

Pakistan's position raises the possibility of a supension of a new $540 million economic and military aid package from the United States and could jeopardize bilateral talks on the supply of advanced radar-equipped aircraft to Pakistan.

Pakistan has denied any connection with the man arrested in Philadelphia and has issued an arrest warrant for a retired Pakistani military officer, Inam ul-Haq, who has been linked to the case.