This week, the mercurial magnate said 10 percent tariffs on all Chinese imports could kick in on February 1 -- and on the campaign trail touted a levy as high as 60 percent.

President Donald Trump is considering changing a key U.S. trade benefit to other nations, the "de minimis" exemption on import tariffs, as he accuses China of unfair trade practices and blames it for a crisis over the deadly drug fentanyl.