What parallels do historians see between the Trump administration and the Nazi regime?

Elon Musk seemed to make a Nazi salute when he celebrated the start of Donald Trump’s second term as American president. Trump’s new administration said that it acquired Greenland and Panama, has financed American foreign aid programs, dismissed the federal and humiliated workers, Ukrainian President Volodymyr Zelensky in the Oval Office. Some historians have parallels between the second term Trump and Hitler’s regime. Eighty years after the end of the Second World War, is the comparison relevant?