LONDON—Prime Minister Theresa May on Monday appointed a second-generation Briton to lead the department responsible for immigration and security, as she tried to contain swelling criticism over the government’s mistreatment of a group of long-term residents from British colonies, many of whom arrived as children.
The appointment of Sajid Javid, 48, as home secretary comes at a critical time for the beleaguered prime minister, who has lost four cabinet ministers in six months and is under increasing scrutiny over tough immigration...