LONDON — In almost every way, British Prime Minister Keir Starmer will walk into the White House on Thursday as an alien in President Donald Trump’s MAGA universe: a former human rights lawyer, a onetime top prosecutor and, after vanquishing Conservatives in elections last summer, the United Kingdom’s most liberal leader in more than a decade.

British Prime Minister Keir Starmer is set to meet with President Donald Trump at the White House on Thursday to address the ongoing conflict in Ukraine and bilateral trade ties, amid the U.S. leader’s tariff threats on Europe and demands that the continent rely less on Washington for its security.