The US has told Germany it would curb intelligence sharing with Berlin if it allows Huawei to participate in its 5G mobile network.
The warning came in a recent letter from the US ambassador to Germany seen by the Wall Street Journal.
The US has been lobbying its allies to boycott Huawei due to national security risks.
The firm has pushed back against claims it poses a security threat including suing the US government.
The US, Australia and New Zealand have all blocked local firms from using Huawei to provide the technology for their 5G networks.
Huawei has launched a more aggressive strategy in recent months to counter what it sees as an American "smear" campaign.
Huawei has also taken out ads in the foreign press and invited foreign journalists to visit its campuses.