Congress should remove a provision that would expand Trump’s ability to wage unrelated trade wars. The day before Sen. Lindsey Graham died, he and a bipartisan group of colleagues announced that they had reached agreement with the Trump administration on a bill to impose new U.S. sanctions on Russia. Graham’s colleagues now want to pass that bill as a memorial to him. Congress should change it first.

The bill as written would give President Trump a new legal tool to continue his destructive trade wars. Congress is right to increase pressure on Russia, whose economy is under stress from earlier rounds of U.S. and European sanctions as well as Ukraine’s intensifying drone strikes against Russian oil refineries, military factories and other economic infrastructure. President Volodymyr Zelensky has called those attacks “long-range sanctions.”

But the centerpiece of Graham’s bill would hand Mr. Trump a new tool to impose sweeping U.S. tariffs on countries that buy oil or gas from Russia. He would almost certainly use that tool as a legal pretext to threaten tariffs on American friends, allies and adversaries alike.

Congress should change it first.