Republican Senator Lindsey Graham has pledged to push through a sweeping package of sanctions designed to cripple Russia’s economy, including a dramatic proposal to impose 500% tariffs on any country purchasing Russian oil or gas.

The Trump administration is trying to get Sen. Lindsey Graham (R., S.C.) to weaken his sanctions bill as the president tries to improve U.S. relations with Moscow.

I would expect next week that the Senate will start moving the sanctions bill,” said Graham, an ally of President Trump but also a firm backer of Ukraine’s war efforts.