Labor unions and Democrats slammed the White House Thursday for weighing in against public-sector unions in a major Supreme Court case, saying the Trump administration’s opposition to mandatory union dues threatens the unions’ ability to represent government workers.

“While President Trump boasts his support for working families, his administration is advocating a position in the United States Supreme Court that disregards decades of settled law and threatens our livelihoods. Yet again, his actions are failing his rhetoric and making clear that he has no intention of following through on his commitments to working people,” AFL-CIO President Richard Trumka said.