European Union President Donald Tusk is wading into the British debate on EU membership by deriding ex-London Mayor Boris Johnson for comparing the bloc's aims to those of Adolf Hitler.

Tusk said Tuesday that even though the EU had stayed on the sidelines of the British debate on whether to leave the EU, "when I hear the EU being compared to the plans and projects of Adolf Hitler I cannot remain silent."

Johnson argued over the weekend that the 28-nation bloc is creating a superstate that mirrors the attempt of the Nazi leader to dominate the European continent.

Tusk said in Copenhagen that "such absurd arguments should be completely ignored if they hadn't been formulated by one of the most influential politicians of the ruling party."