 After voting in favor of the Tax Cuts and Jobs Act of 2017, his constituents rated him at a 40 percent approval rating and 45 percent said they were disappointed with his work in Congress.In May 2018, the Associated Press reported that Mast was under consideration by the Trump administration to become the next secretary of the Department of Veterans Affairs.As of January 2018, Mast had voted with his party in 89.9% of votes in the 115th United States Congress and voted in line with Trump's position in 94.9% of the votes.