The US president said on Thursday he is “surprised at how badly” the UK’s negotiations with the European Union have been handled.
He added that he gave the prime minister advice on the negotiations but she did not listen.
“It’s a very complex thing right now, it’s tearing a country apart, it’s actually tearing a lot of countries apart and it’s a shame it has to be that way but I think we will stay right in our lane,” Mr Trump said.
“I’m surprised at how badly it has all gone from a stand point of negotiations but I gave the Prime Minister (Theresa May) my ideas of how to negotiate it, she didn’t listen to that and that’s fine but it could have been negotiated in a different manner.”
He added: “The EU has been very tough to deal with and frankly it’s been very one-sided for many years so we are changing that around.”
MPs will vote on Thursday whether to seek a delay to Brexit, which is scheduled for March 29.
Mrs May granted the vote after Parliament twice rejected her proposed EU divorce deal .
Mr Trump made the comments as he welcomed Irish Prime Minister Leo Varadkar to the White House for an early St. Patrick’s Day celebration.