The upper house of parliament voted 57-23, with two abstentions, to approve the bill. Pic/AFP

Poland's Senate has backed legislation regulating Holocaust speech, a move that has already strained relations with both Israel and the United States. The bill proposed by Poland's ruling conservative party and voted for early Thursday calls for up to three years in prison for any intentional attempt to falsely attribute the crimes of Nazi Germany to the Polish state or people. Though the bill exempts artistic and research work, it has raised concerns that the Polish state will decide itself what it considers to be facts.