Shenzhen, July 12 -- The chairman of Huawei said Friday the Chinese tech giant has yet to see any benefit from President Donald Trump's promise to allow U.S. companies to sell some components to the company and called on Washington to remove it from a security blacklist.

The "unjust and unfair" decision to add Huawei Technologies Ltd., the biggest maker of network equipment for phone companies, to a list that restricts exports is hurting its U.S. suppliers and global customers, Liang Hua told a news conference.

American officials accuse Huawei of facilitating Chinese spying, a charge the company denies, and see it as a growing competitor to U.S. technology industries. Its founder, Ren Zhengfei, said in June the company has cut sales for...