WASHINGTON - Huawei Technologies Co Ltd and ZTE Corp on Monday both asked the US Federal Communications Commission (FCC) not to finalize its designation of the China tech giants as risks to US national security.

In November, the FCC voted 5-0 to initially designate Huawei and ZTE as national security risks in a move that would bar their US rural carrier customers from tapping an $8.5 billion government fund to purchase equipment.

Huawei said in a nearly 200-page filing with the FCC the action was "designed to implement a campaign by certain government officials, including members of Congress, to single out Huawei for burdensome and stigmatizing restrictions, put it out of business in the United States, and impugn its reputation here and around the world." It called the effort "unlawful and misguided."

ZTE asked the FCC Monday in a filing to "take additional time to assess ZTE’s enhancements in the area of US export control and economic sanctions compliance and security controls in ZTE products."

ZTE added it has "spent hundreds of millions of dollars to implement a compliance program relating to US export control compliance regulations."

The commission left the final determination to the FCC's Public Safety and Homeland Security Bureau, which could determine not to finalize the risk designation.

Such a move would run counter to the Trump administration's stance to date, after its blacklisting of Huawei in May sharply restricted the export of US high-tech components to the company.

The administration has also tried with limited success to persuade its allies to bar Huawei, saying its equipment could potentially be used by Beijing for spying.

Huawei has repeatedly denied those allegations, and scored a big win last week when the UK announced it was giving Huawei a role in its new generation of telecoms infrastructure.

In its November vote, the FCC proposed requiring that US carriers remove and replace equipment from both Huawei and ZTE, also China-based, from existing networks.

The companies' ties to the Chinese government and military apparatus, and laws requiring their assistance in intelligence activities, are why they pose a security risk, the FCC said.