Mr Tusk denounced the words as "all too familiar and ominous", and his tourism minister, Sławomir Nitras, has gone even further and called for Polish citizens - around 6 million of whom died in the Holocaust - to launch a boycott of Tesla vehicles in response.

Tesla will launch an “unsupervised, no one in the car” robotaxi service in Austin, Texas, in June, Elon Musk said in an earnings call Wednesday. “We just want to put a toe in the water, make sure everything’s okay,