Trump, in an evening post on his social media platform Truth Social, said he has instructed the Commerce Department and US Trade Representative to place a 100% tariff on films that are produced outside the United States and imported into America.

The president called the use of incentives by foreign countries to draw filmmakers and studios away from the U.S. a national security threat.

Here are seven major questions left unanswered on Trump’s proposal: Trump only said he was “authorizing” the U.S. Trade Representative and the Commerce Department to impose a 100% tariff on foreign films. He didn’t say he would do it. With previous tariff threats, Trump has sometimes made good and sometimes backed off in the face of pressure.