Huawei has filed a lawsuit against the US government over a ban that restricts federal agencies from using its products.
It said the US failed to provide evidence to support the ban, and the firm also rejected claims it had links to the Chinese government.
The US has restricted the use of Huawei products over national security concerns.
It has also been lobbying allies to shun the Chinese telecoms firm.
Huawei is one of the world’s largest telecommunications equipment and services providers.
The lawsuit is part of a wider push by the company in recent months to challenge claims its products pose security risks.
“The US Congress has repeatedly failed to produce any evidence to support its restrictions on Huawei products. We are compelled to take this legal action as a proper and last resort,” Huawei Rotating Chairman Guo Ping said in a statement.
“This ban not only is unlawful, but also restricts Huawei from engaging in fair competition, ultimately harming US consumers.”
Speaking at a press conference in Shenzhen, Mr Ping also accused the US government of misleading the public about Huawei and of hacking its servers.
Huawei’s cyber security chief John Suffolk said it was “the most open [and] transparent company in the world”.
But the company was later criticised for cutting the live feed of its conference before journalists could begin asking questions.
What does the lawsuit say?
Huawei is challenging the constitutionality of Section 889 of the National Defense Authorisation Act. The complaint has been filed in a US federal court in Texas.
Huawei also rejected claims it had any links to the state, saying in a statement the firm was “not owned, controlled, or influenced” by the Chinese government.
Several governments around the world, including Australia and New Zealand, have blocked telecoms companies from using Huawei gear in next-generation 5G mobile networks, citing security concerns.