Poland’s President Karol Nawrocki called off a visit to Africa in mid-flight, as riot police deployed around the country’s constitutional court on Friday following the suspension of its chief justice in a battle between the centrist government and the nationalist right. Dozens of police guarded the entrance to the court as followers of the opposition right-wing Law and Justice party (PiS) protested against the ousting of constitutional court president Bogdan Swieczkowski. The court’s official...