Huawei has launched new over claims the Chinese telecoms giant poses a security risk, reports BBC.
It comes after the US Federal Communications Commission (FCC) put curbs on rural mobile providers accessing a $8.5bn (£6.5bn) government fund to buy Huawei equipment.The firm said evidence that it is a threat to security "does not exist"
The development is the latest in a series of legal challenges between Huawei and the US.
The company has asked the US Court of Appeal to overturn a decision that stops mobile firms in rural parts of America using money from a government fund to help buy infrastructure equipment.
Huawei has a leading role in manufacturing and selling key technology for next generation 5G telecoms infrastructure.