Dec. 28, 2020 6:26 pm ET President Trump will soon leave town, but his tariffs may be staying. Joe Biden hasn’t been exactly clear about his trade policy, so perhaps it’s time to point out one unsightly effect of the Trump tariffs: expanding the D.C. swamp. Republicans who cheered when the Trump Administration picked winners and losers might soon find out what it’s like when the Biden Administration does it. Take Missouri Sen. Josh Hawley, who lobbied last year for a company in his state, SM Products, to get tariff exclusions on imported Chinese-manufactured saw blades. In a Sept. 19, 2019, letter to the U.S. Trade Representative (USTR), four members of Missouri’s congressional delegation, including Mr. Hawley, argued that “it would not be beneficial to impair a small American company that does not have the financial resources or alternative supply chain options.” Since SM’s costs and prices are “locked in many months before delivery,” the legislators wrote, the Missouri company “must absorb the entire cost of the tariffs,” likely precluding profitability.