A federal judge temporarily blocked President Donald Trump’s ban on foreign service worker unions, expanding an injunction handed down by the court last month.

The president’s sweeping March 27 executive order , which sought end federal collective bargaining, exceeded Congress’s intent to allow only narrow exclusions under a 1980 law granting collective bargaining rights to foreign service workers, Judge Paul L. Friedman of the US District Court for the District of Columbia said on Wednesday.

The decision is another setback for Trump’s multifaceted effort to tighten his grip on the federal workforce. It comes after Friedman last month found that ...