The bloc’s spending plans were on Friday set to be one of the main topics discussed by leaders at an EU summit in Brussels.
Poland has announced that it opposes a new draft budget proposed by Finland, which holds the rotating presidency of the EU until the end of the year.
Helsinki has laid out spending plans which propose cuts compared to a budget proposed last year by the European Commission, the EU’s executive.
"Countries that want to reduce the EU budget while simultaneously saying that there should be ‘more Europe’ are being very deeply inconsistent," Morawiecki told reporters.
EU leaders gathered in Brussels were also set to discuss climate policy on Friday.