Sen. J.D. Vance (R-OH), former President Donald Trump’s pick for vice president, has an economic policy vision that is unorthodox for Republican candidates aiming for the White House.

The 39-year-old senator has held elected office for about a year and a half but has carved out uniquely populist economic positions on Capitol Hill, many that are in line with Trump’s embrace of protectionism and trade policies designed to reinvigorate the country’s manufacturing industry.