Yotam Ophir, a lecturer on disinformation at the University of Buffalo, told the BBC the "vermin" rhetoric specifically echoed propaganda films produced by the Nazis, which compared Jewish people to rats and insects.
"While I agree it's politically charged to compare someone to Hitler or Nazi Germany," Mr Ophir said, "I think we should be able to say that calling the whole left side of the political map 'vermin' and a danger to our country is more alarming than saying those claims are reminding us of dark times from the past."