BRUSSELS—German Chancellor Angela Merkel and French President Emmanuel Macron urged fellow EU leaders on Thursday to take a firmer line on travel from countries outside the bloc, such as Britain, to combat the Delta variant of the coronavirus. Merkel, arriving in Brussels for a European Union summit, said she would lobby for a more coordinated approach, particularly with regard to letting tourists in from regions where virus variants were widespread. “We are obviously concerned about the Delta variant,” she told reporters. Macron told EU countries to be extremely vigilant about the variant, first found in India, which is highly infectious. Macron said the 27-nation bloc needed to take coordinated decisions on opening borders to people from other countries. The warnings came as British Prime Minister Boris Johnson hinted that the UK was close to permitting unrestricted travel abroad for fully vaccinated people. EU governments have agreed on a “white list” …