A number of free trade stalwarts are stepping down as this session comes to a close, from Sen. Pat Toomey (R-Pa.) to Sen. Rob Portman (R-Ohio) — himself a former U.S. Trade Representative. While there will still be plenty of free traders in Congress next term, a number of those market-expanding, tariff-lowering stalwarts will be replaced by new members more protectionist than them.

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