President Donald Trump and his fellow Republicans are reviving a line of attack against Democrats heading into the midterm elections: They’re communists.

In just the past week, Trump has issued dark warnings that members of the Democratic Party’s ascendant left are communists who want to “completely destroy the traditional American way of life” and even engage in assassinations. Vice President JD Vance has similarly called out communism as a political shift that is “something we haven’t seen in the U.S.” House Speaker Mike Johnson has decried “radical candidates” who are “self-described, self-identifying Marxists.”

The GOP’s ideological focus conflates democratic socialism, which often centers on securing universal healthcare, higher taxes on the wealthy and stricter corporate regulation, with communism, under which private ownership is largely eliminated. It has been building since Zohran Mamdani, a democratic socialist, won the Democratic nomination for New York City mayor last year.

But it’s kicked into a higher gear recently after democratic socialists won several New York City congressional primaries last week. The primary victory on Tuesday by another democratic socialist, Melat Kiros, for a Denver congressional seat suggested the trend may extend beyond Manhattan liberalism.