Donald Trump has said Britain would be better off leaving the European Union.
Voters will take part in an in/out referendum on June 23.
The Republican presidential candidate told Fox News: "I think the migration has been a horrible thing for Europe. A lot of that was pushed by the EU.
"I would say that they're better off without it personally, but I'm not making that as a recommendation - just my feeling."
Last month, President Barack Obama faced criticism for wading into the debate, saying he thought Britain should remain in the EU.
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