The Trump administration has assessed $4.4 billion worth of duties on steel and aluminum imports and a range of goods from China under the tariffs it imposed in an effort to protect U.S. companies.

A spokesman for the Department of Homeland Security told the Washington Examiner that importers owe the federal government $4.4 billion for importing goods hit by the tariffs through Oct. 2, but said it was unclear how much of that total has been collected. The Treasury Department didn’t have details on what portion of the $4.4 billion had been collected, and how much was still owed.