"Iraq is suffering heavy losses in clashes with Daesh [IS] militants, while America keeps postponing the delivery of F-16 planes", Iskandar Watout was cited as saying by the Iraqi Media Network (IMN).
But Watout said the parliament's defense committee was now discussing a request for a formal explanation from Washington, which has contractual obligations to supply Iraqi forces with small arms, warplanes, tanks, armored vehicles and Apache helicopters worth billions of dollars.
"Our government should stop buying warplanes and equipment from just one source," Watout added. This comes after Iraq received the first batch of Russia's Su-25 fighter jets in June.
Contracts to arm and train Iraqi security forces were signed within the framework of a 2008 strategic partnership agreement between Iraq and the United States back in 2008. Hakim al-Zamili, an Iraqi lawmaker who heads the security and defense committee, earlier threatened the Pentagon with international litigation to secure the return of the money Baghdad paid for US arms deliveries.