An influential US Congress committee is set to call for investigations against Huawei Technologies, the world’s second-largest network equipment vendor, for alleged bribery and violations of US immigration laws.

In a draft report about Huawei and its smaller Chinese peer ZTE, the House Permanent Select Committee on Intelligence, one of two congressional intelligence committees, concluded that both companies pose a threat to US national security and should be restricted more tightly from doing business in the US.

While the report – which was due to be published on Monday night in the US – is advisory in nature, its specific allegations against Huawei might add new hurdles for the Chinese telecom equipment maker’s long-running attempt to break into the US market.