Britain's Prime Minister Theresa May (L) shakes hands with Britain's Secretary of State for Exiting the European Union (Brexit Minister) David Davis (R), who introduced her, as she arrives on stage to launch the Conservative Party general election manifesto in Halifax in northern England on May 18, 2017.
British Prime Minister Theresa May will on May 18 promise to crack down on immigration from outside the European Union as she unveils the Conservative Party's manifesto.  / AFP PHOTO / POOL / Dan Kitwood        (Photo credit should read DAN KITWOOD/AFP/Getty Images)