(Reuters) — U.S. lawmakers are urging AT&T Inc, the No. 2 wireless carrier, to cut commercial ties to Chinese phone maker Huawei Technologies Co Ltd and oppose plans by telecom operator China Mobile Ltd to enter the U.S. market because of national security concerns, two congressional aides said.

The warning comes after the administration of U.S. President Donald Trump took a harder line on policies initiated by his predecessor Barack Obama on issues ranging from Beijing’s role in restraining North Korea to Chinese efforts to acquire U.S. strategic industries.

Earlier this month, AT&T was forced to scrap a plan to offer its customers Huawei handsets after some members of Congress lobbied against the idea with federal regulators, sources told Reuters.

The U.S. government has also blocked a string of Chinese acquisitions over national security concerns, including Ant Financial’s proposed purchase of U.S. money transfer company MoneyGram.

The lawmakers are also advising U.S. firms that if they have ties to Huawei or China Mobile, it could hamper their ability to do business with the U.S. government, one aide said, requesting anonymity because they were not authorized to speak publicly.

One of the commercial ties senators and House members want AT&T to cut is its collaboration with Huawei over standards for the high-speed next generation 5G network, the aides said. Another is the use of Huawei handsets by AT&T’s discount subsidiary Cricket, the aides said.

Chinese foreign ministry spokesman Lu Kang said on Tuesday he did not know anything about the details of the commercial cooperation cases,…

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