The Environmental Protection Agency has nullified all but one of its collective-bargaining agreements with employee unions, acting on an executive order issued earlier this year by President Donald Trump that seeks to limit federal workers’ negotiating rights in the name of national security. The agency’s Aug. 8 move followed a Ninth Circuit Court of Appeals decision on Aug. 1 lifting an injunction that had blocked the order. Under a new internal directive, EPA employees must now obtain prior approval for union-protected activities even on their own time, a policy critics say amounts to “100 percent union-busting.” The American Federation of Government Employees, which represents about 8,000 EPA staff, is preparing additional unfair-labor-practice complaints while litigation over the executive order continues. Labor leaders estimate the order ultimately affects roughly 400,000 federal workers across 21 agencies. The AFL-CIO and Democratic lawmakers are pressing colleagues to sign a discharge petition for the Protect America’s Workforce Act, legislation that would overturn the order and reinforce collective-bargaining rights. Representatives Delia Ramirez and Nikema Williams warned that curbs on bargaining will hamper agencies’ ability to serve veterans, safeguard public health and maintain workplace safety.