Following the UK’s decision to include Huawei in their 5G networks, U.S. senators are urging the House of Commons to reconsider.

A bipartisan group of 20 senators have penned a letter to the House of Commons to express “significant concern with the Government of the United Kingdom’s recent decision to allow Huawei Technologies in its 5G network infrastructure. Given the significant security, privacy, and economic threats posed by Huawei, we strongly urge the United Kingdom to revisit its recent decision, take steps to mitigate the risks of Huawei, and work in close partnership with the U.S. on such efforts going forward.”

The senators go on to point out that the UK has already “warned that Huawei’s telecommunications equipment raises ‘significant’ security issues,” and highlights the Chinese government’s track record of compelling Chinese companies to cooperate with its intelligence-gathering efforts.

The letter concludes by thanking the House of Commons for its “consideration of this critical issue, as well as for the trusted partnership between our governments which we remain committed to uphold.”

The senators’ letter is the latest in efforts by U.S. officials to isolate Huawei and restrict its growth worldwide. Whether such efforts will succeed remains to be seen.