A group of 47 House Republican lawmakers is urging the heads of Congress’ appropriations committee to restrain the National Labor Relations Board from implementing several of former President Barack Obama’s changes to labor regulations.

A letter from the GOP members of Congress argues the board, the main federal labor law enforcement agency, went too far and instituted changes that shift the balance in favor of union recruiting efforts. It asks the appropriators to include provisions in the fiscal 2018 Labor, Health and Human Services and Education budget that would block the labor board from proceeding with Obama’s changes.