Several thousand conservative opposition supporters are demonstrating in Poland against new Prime Minister Donald Tusk’s centre-left government. The predominantly older supporters of the nationalist conservative Law and Justice party (PiS) were gathered in front of the parliament building in Warsaw early Thursday evening. They waved Polish flags and placards reading: “This is Poland, not Tusk’s country.” PiS party leader Jarosław Kaczyński told the demonstrators: “This is not a Polish government.” The PiS frequently accuses Tusk, a former European Council president, of acting on behalf of Germ…