Britain’s government on Monday promised to tighten migration rules and make it harder for newcomers to permanently stay in the country, in a sign of the increasing political pressure on Prime Minister Keir Starmer to cut immigration numbers. In a speech from Downing Street, Mr. Starmer, who leads the governing Labour Party, accused his predecessors of allowing immigration to run out of control and effectively creating an experiment with open borders. “Today this Labour government is shutting down the lab. The experiment is over. We are taking back control of our borders,” he said, adopting the slogan used by pro-Brexit campaigners ahead of Britain’s referendum on leaving the European Union in 2016.
