U.S. President Donald Trump says he has urged Britain to maintain pressure on Iran and agreed with Prime Minister Theresa May that Tehran must never possess nuclear weapons.
Trump and May spoke at a joint news conference after talks at the British prime minister's official country residence, Chequers, on July 13.
May said that she and Trump discussed what more could be done on Iran.
They also discussed Russia, among other topics, and May thanked Trump for U.S. support after the poisoning of a former Russian spy and his daughter in England in March, which her government blames on Russia.
WATCH: Multiple Protests Against Trump Held In Britain
Trump is in Britain for a visit sandwiched between a July 11-12 NATO summit in Brussels and a summit with Russian President Vladimir Putin in Helsinki on July 16 -- his first full-fledged meeting with Putin since taking office in January 2017.
Trump said the issues he would discuss with Putin include the conflicts in Ukraine and Syria and Russia's alleged meddling in elections including the 2016 vote that put him in office.
Asked by a reporter whether he would be giving Putin the upper hand, Trump took issue with such an assessment and said that his administration has been "extremely tough" on Russia.
He also said it would be "tremendous" if the United States and Russia could make headway on nuclear nonproliferation, and that it would be "a good thing" if the United States could get along with Russia and China.
Earlier, Trump said the U.S. relationship with Britain was "very, very strong," even though he has publicly criticized May's strategy to leave the European Union.
In an interview with The Sun newspaper published on July 13, Trump said May's plan would "probably kill" any trade deal with the United States.
But in initial remarks at Chequers, Trump said he and May had "probably never developed a better relationship" than during his trip, his first to Britain as president.
Several protests have taken place across Britain on July 13, including flying a giant balloon over Parliament in London that depicted Trump as an angry diaper-wearing baby.
In his interview with The Sun, Trump also blamed London Mayor Sadiq Khan for terror attacks against the city and argued that Europe was "losing its culture" because of immigration.