Dominic Raab has met with Donald Trump just hours after Britain's hopes of securing a US Brexit trade deal were branded "delusional".
The Foreign Secretary held talks with the US President in Washington DC, the Foreign Office said.
Mr Raab, on his first visit to the United States since taking office last month, met with Trump and Vice President Mike Pence on Tuesday evening.
In a brief statement, Mr Raab said: "I was delighted to meet the president and the vice president on my first visit to Washington as Foreign Secretary.
"We appreciate the president's warmth and enthusiasm for the UK-US relationship.
"The UK looks forward to working with our American friends to reach a free trade deal that is good for both countries, and co-operating on the common security challenges we face."
No further details of the meeting were immediately available.
Mr Raab is due to have further talks on Wednesday with other senior administration figures including Secretary of State Mike Pompeo and National Security Adviser John Bolton.
Larry Summers, one of ex-President Barack Obama’s top economic advisers, claimed Boris Johnson ’s chances of a favourable agreement were “delusional”.
The former US Treasury Secretary’s warning that the UK would have “no leverage” in trade negotiations came as Dominic Raab arrived in Washington.
The new Foreign Secretary has pledged to “fire up” Britain’s economic relations outside the EU.
But Mr Summers said: “If Britain thinks American financial regulators, who have difficulty coming together on anything, are going to come together to give greater permissions and less regulation to UK firms, I would call that belief close to delusional."
He added: “Britain has much less to give than Europe as a whole did, therefore less reason for the US to make concessions.
“You make more concessions dealing with a wealthy man than you do dealing with a poor man.
"Second, Britain has no leverage. Britain is desperate. It needs an agreement very soon.”
