The Trump administration is considering imposing export restrictions on China’s biggest chip maker, SMIC.

The US has been increasingly targeting Chinese companies, including Huawei, ZTE, TikTok and WeChat, citing national security concerns. Huawei and ZTE have been banned in the US, with TikTok and WeChat facing imminent bans.

As the trade war heats up, it appears US officials are not slowing down. SMIC is China’s biggest chipmaker, and it appears it is coming under increased scrutiny. According to CNBC, the Department of Defense is analyzing whether it should be placed on the Entity List, a step that would make further restrictions much easier.

“DoD is currently working with the interagency in assessing available information to determine if SMIC’s actions warrant adding them to the Department of Commerce’s Entity List,” said a DoD spokesperson. “Such an action would ensure that all exports to SMIC would undergo a more comprehensive review.”

Should the US proceed with this step, it remains to be seen what retaliatory measures the Chinese government may take.