Senate Finance Committee Chairman Chuck Grassley has warned President Trump that his U.S.-Canada-Mexico Agreement on trade can’t pass Congress if he retains steel and aluminum tariffs on Canada and Mexico.

“If these tariffs aren’t lifted, USMCA is dead. There is no appetite in Congress to debate USMCA with these tariffs in place,” Grassley, an Iowa Republican, said in a Wall Street Journal op-ed published in its Monday edition.