PM Mateusz Morawiecki has cancelled a trip to Israel following comments on the Holocaust by Israeli counterpart Benjamin Netanyahu.
Mr Netanyahu was quoted in Israeli media as saying “Poles co-operated with the Germans” during the Holocaust.
He later issued a clarification saying he was not referring to the Polish nation or all Polish people.
Poland summoned the Israeli ambassador and on Sunday said Mr Morawiecki would not attend a summit on Tuesday.
The meeting, hosted by Israel, is of the Visegrad Group that represents the Czech Republic, Hungary, Poland and Slovakia.