The Supreme Court on Wednesday upheld the Biden administration’s regulation of untraceable “ghost guns,” ruling that the weapons can be subject to background checks and other requirements.

The 7-2 decision, which overturned an opinion by a conservative appeals court, was a victory for former President Joe Biden. But President Donald Trump could repeal the regulation, something gun rights advocates are counting on.

Writing for the majority, Justice Neil Gorsuch said the Gun Control Act allows the government to regulate some weapon parts kits and unfinished frames or receivers.

Justices Clarence Thomas and Samuel Alito dissented.