 In January 2019, Daines was one of eleven Republican senators to vote to advance legislation intended to block President Trump's intent to lift sanctions against three Russian companies.In June 2019, Daines was one of eight senators to sign a letter to Premier of British Columbia John Horgan expressing concern over "the lack of oversight of Canadian mining projects near multiple transboundary rivers that originate in B.C.and flow into" U.S. states Alaska, Idaho, Washington, and Montana.