President Donald Trump’s executive order to end so-called birthright citizenship for babies of undocumented immigrants was blocked indefinitely by a fourth federal judge, handing the administration another legal setback and signaling an uphill constitutional fight.

U.S. President Donald Trump's effort to curtail automatic birthright citizenship as part of his hardline immigration crackdown suffered a further setback on Thursday as a fourth judge declared it unconstitutional.

A federal judge in New Hampshire granted a preliminary injunction against an executive order that would end birthright citizenship.