Donald Trump’s extreme rhetoric reminiscent of Nazi propaganda and his penchant for siding with America’s adversaries and autocrats pose a unique challenge to his Republican opponents and, ultimately, US voters.

The ex-president, who has a good chance of being the next commander in chief, warned over the weekend that immigrants are “poisoning the blood” of the United States. And he parroted Russian President Vladimir Putin’s attempts to discredit American democracy in his latest craven genuflection to the ex-KGB officer, who’s been accused of war crimes.

Trump’s comments on Saturday, at a rally in the first-in-the-nation GOP primary state of New Hampshire, are contrary to America’s founding values and political traditions. They are the latest sign that Trump, who sought to overturn the will of the voters after the 2020 election, would act in an even more extreme fashion in a second White House term. His rhetoric is also likely to play into the central premise of President Joe Biden’s reelection campaign – that he’s the only option to thwart a return to power by an ex-president who could destroy US democracy. It is not yet, however, helping the incumbent in polls that show him trailing Trump in vital swing states.