A federal judge blocked a Trump administration policy barring migrants who cross the US-Mexico border from seeking asylum, issuing a major blow to President Donald Trump, who has sought to seal off access to protections on the border.

A federal judge in Washington, D.C., has blocked the Trump administration policy that restricts migrants who cross the southern border from seeking asylum.

It throws into doubt one of the key pillars of the president’s plan to crack down on migration at the southern border.