President Donald Trump during a meeting in the Oval Office on Thursday. (Demetrius Freeman/The Washington Post) By David Nakamura , Marianne LeVine , Jeremy Roebuck and John Hudson

President Donald Trump’s travel ban on 19 countries came under mounting criticism Thursday from congressional Democrats and at least one Republican, but legal experts predicted the order would be difficult to stop through challenges in court. Subscribe for unlimited access to The Post You can cancel anytime. Subscribe

Advocates for immigrants and some Democratic state attorneys general said they are examining the restrictions — including a full ban on travelers from 12 nations and a partial ban on those from seven others — for potential legal action. Federal courts blocked two versions of a travel

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