A labor leader calls Trump's effort to gut federal unions "the most significant attack on workers’ rights in history."

A federal judge on Thursday blocked key parts of a sweeping anti-voting executive order issued by President Donald Trump in March. Voting rights advocates described the order as “an astonishing and unprecedented voter suppression” effort that would upend how Americans register to vote, how they cast their ballots, and how their votes are counted.

An order signed by President Trump last month was aimed at stripping collective bargaining rights from hundreds of thousands of federal workers.