JD Vance, the Republican vice-presidential nominee who rose to fame detailing his Appalachian roots in a best-selling memoir, has made appeals to working-class and middle-class voters a core tenet of his campaign messaging.

In rallies and interviews, Mr. Vance has sought to portray the Republican ticket as a champion of everyday people, first-time home buyers and autoworkers by misleadingly describing Vice President Kamala Harris’s policies and positions on housing, trade and manufacturing.

Here’s a fact check of some of his claims.

What Was Said

“Kamala Harris let in 20 million illegal aliens to compete with Americans for scarce homes.”
— in a local news interview in August

This is exaggerated. Economists and real estate experts say that while migration, including illegal immigration, has contributed to population growth and thus demand for housing, it is not a main driver of the country’s housing affordability crisis. A lack of supply is the primary culprit, they said.

Daryl Fairweather, the chief economist at the online real estate brokerage Redfin, said Mr. Vance’s claim “ignores the root causes of the housing shortage, which is that we just stopped building homes, especially in places where people want to live the most, and don’t really need to talk about immigration to talk about that problem.”

After the Great Recession, the number of new homes built annually plummeted and never really recovered in the two decades that followed. As a result, researchers and real estate firms now estimate a nationwide shortage of 1.5 million to seven million housing units.