Polish government politicians criticized a statement by US presidential candidate Donald Trump on NATO's duty to provide assistance. Defense Minister Władysław Kosiniak-Kamysz emphasized that the NATO principle "One for all, all for one" was "a concrete obligation" Interior Minister Marcin Kierwiński was quoted by the PAP news agency as saying: "Trump is directly calling for Europe to be handed over to Putin" President Andrzej Duda, however, warned: "The alliance between Poland and the USA must be strong"