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

Elon Musk appeared to make a Nazi salute as he celebrated the start of Donald Trump’s second term as US president. Trump’s new administration has said it will acquire Greenland and Panama, defunded US foreign aid programmes, fired federal workers and humiliated Ukraine’s President Volodymyr Zelensky in the Oval Office. Some historians draw parallels between the second Trump term and Hitler’s regime. Eighty years after the end of the World War II, is the comparison relevant?