The Chinese telecoms company was blacklisted last year, limiting the company's suppliers.

This year, India restricted imports of Chinese telecoms network equipment over security fears.

The amendment is primarily targeted at the Chinese telecoms firm Huawei.

The letter comes amid growing pressure on Chinese telecoms companies operating in the United States.

Some analysts doubt that even a widespread ban on Chinese telecoms networks equipment could possibly guarantee watertight security.

The US Justice Department has filed criminal charges against Huawei, but will this sink the Chinese telecoms giant?

Their calculation assumes a 30 percent discount to international rivals, similar to the markdown investors place on Chinese telecoms.

Trump also said the United States would continue to refrain from doing business with Chinese telecoms equipment giant Huawei Technologies.

Both sides would also agree to monitor the market share of Chinese telecoms companies in Europe and European companies in China.

The slide in Apple's market share may prove temporary or until it can sign a deal with a Chinese telecoms network.

Much remains unclear about Canada's arrest of a powerful executive from Chinese telecoms behemoth Huawei at the request of the US.

The U.S. president also says the United States will continue to refrain from doing business with Chinese telecoms equipment giant Huawei.

Photo: AFP John McCallum made the remarks about an extradition case involving a senior executive from the Chinese telecoms giant Huawei.

The decision frustrated a global attempt by the United States to exclude the Chinese telecoms giant from the West's next-generation communications.

The EU is also gathering evidence to see whether Chinese telecoms companies Huawei Technologies and ZTE are dumping or receiving illegal subsidies.

But late on Monday, the United States granted the Chinese telecoms equipment maker a license to buy U.S. goods until Aug. 19.