My friend wants to travel with me on a trip to Detroit. The problem is he only has a 1951 convention travel document as he is an Iranian refugee and has been living in the UK for four years.
Also does he need any kind of visa before going?
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He will need to get a U.S. visa, like any other foreigner without a passport from a visa-free or visa-waiver country. What type of visa depends on what he is going to the U.S. for; e.g. for tourism probably B2 or B1/B2.