WASHINGTON  — President Trump said Friday that his defense secretary’s opposition to torture would override his own belief that enhanced interrogation “does work,” addressing concerns about a return to Bush-era use of waterboarding and other especially harsh procedures.

Trump, joined by British Prime Minister Theresa May at a White House news conference, also said he had had a “very good call” with Mexican President Enrique Pena Nieto earlier in the day but reaffirmed his belief that Mexico has “outnegotiated and beat us to a pulp” on trade — and that would change.

“We’re no longer going to be the country that doesn’t know what it’s doing,” Trump declared.

Two issues — whether Trump would allow the use of torture and the U.S.-Mexico relationship — dominated the new president’s brief news conference after his first meeting with another world leader.