Late last week, with much of the political world focused on the first week of the Senate impeachment trial, President Trump imposed more tariffs under the guise of “national security.” By his own admission, Trump’s previous national security tariffs failed to revitalize the protected industries. Now, his only remedy is apparently more tariffs.

This round of protectionism will almost certainly fail, but it should serve as a wake-up call to Congress that it is time to restrict the president’s discretionary authority to raise tariffs unilaterally.