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The case is the latest of a foreign-born national being detained and allegedly held in brutal conditions by US border agents, after Donald Trump's crackdown on immigration.

The two other German nationals affected were Jessica Brsche, a 29-year-old tattoo artist from Berlin, and Lucas Sielaff, 25, from Saxony-Anhalt. Both had valid tourist visas for the US and have now returned to Germany.

According to Sielaff's fiancee, Lennon Tyler, he was detained for two weeks after incorrectly answering a question about where he lived owing to his poor grasp of English. Sielaff had said Las Vegas, where he was staying with Tyler, when he should have said Germany, where he permanently resides, she said.

Brsche " who was travelling with tattoo equipment " was detained for more than six weeks, including nine days in solitary confinement, her friends said " a claim the company that owns the detention centre denies.