"Sounds like a great deal for the EU," he said at the White House, before adding that "we have to take a look at seriously whether or not the UK is allowed to trade."
"You know, right now, if you look at the deal, they may not be able to trade with us, and that wouldn't be a good thing," he said.
In sadness, EU leaders approve Brexit deal
"I don't think they want that at all. That would be a very big negative for the deal."
He expressed hope that Prime Minister Theresa May will "be able to do something about that."
The British leader on Sunday closed 17 months of complex talks with Brussels by sealing Brexit arrangements with the 27 other EU heads of state and government.
However, May faces a difficult task getting parliamentary approval for the deal.
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