President Donald Trump said trade between the U.S. and U.K. could as much as triple if the two countries strike a deal after Britain leaves the European Union.

“As the U.K. makes preparations to exit the European Union, the United States is committed to a phenomenal trade deal between the U.S. and the U.K.,” Trump said Tuesday in London during a news conference with British Prime Minister Theresa May. “There is tremendous potential in that trade deal. I say probably two or even three times of what we’re doing right now.”

Trump has advocated for the U.K. to leave the European Union and aligned himself with some of its staunchest Brexit advocates. Earlier Tuesday, he told May and a group of executives that he sees “a very, very substantial trade deal” between the U.S. and U.K. once it leaves the EU.

May also endorsed a U.S. trade deal.

"Mr. President, you and I agreed the first time we met that we should aim for an ambitious free trade agreement when the UK leaves the EU,” she said. “And from our positive discussions today I know that we both remain committed to this.”

But the two leaders also indicated there would be conflicts in any trade negotiations. Trump, echoing other U.S. officials, said that ``everything will be on the table'' in negotiations -- including the U.K.'s cherished National Health Service, which sets prices and pays for hospitals, drugs and other medical care in the country.

May responded: ``The point about making trade deals is of course that both sides negotiate and come to an agreement about what should or should not be in that trade deal for the future.''

Trump’s comments on Brexit echoed his tweet Monday -- the first day of his state visit to the U.K. -- when he dangled the prospect of a “big trade deal” once the “U.K. gets rid of the shackles.”

The White House also released a statement on Monday saying Trump “supports Brexit being accomplished in a way that will not affect global economic and financial stability while also securing independence to the United Kingdom.”

Asked whether the U.K. should exit the EU by the end of October, with or without a deal with the rest of Europe, Trump said: “I think it will happen, and I believe the prime minister’s brought it to a very good point where something will take place in the not too distant future"

He and May also joked about Trump's advice that the U.K. should have sued the EU over Brexit terms.

``We didn't sue. We went into negotiations and came out with a good deal,'' May said, though Parliament rejected it.

``I would have sued,'' Trump said. ``I would have sued, and settled, maybe.''