Speaking in parliament, May said her meeting with newly inaugurated U.S. President Donald Trump later this week was a sign of the strength of the special relationship between the two countries.

"We will be looking for a UK-U.S. trade deal that improves trade between our two countries that will bring prosperity and growth to this country ... and I can assure ... that in doing that we will put UK interests and UK values first," she said.

She also said she was "not afraid to speak frankly to a president of the United States" when asked whether she was concerned by Trump's comments about women.

(Reporting by Kylie MacLellan, writing by Elizabeth Piper, editing by William James)