WASHINGTON — Vice President Kamala Harris has a new advertising push to draw attention to her plan to build 3 million homes over four years, a move designed to contain inflationary pressures that also draws a sharp contrast to Republican Donald Trump’s approach.

Harris, the Democratic nominee for president, highlights her plan in a minute-long ad released Tuesday that uses her experience of growing up in rental housing while her mother saved for a decade before she could buy a home. The ad targets voters in swing states, including Arizona and Nevada. Campaign surrogates are also staging 20 events this week focused on housing issues.

In addition to increasing home construction, Harris is proposing that the government provide as much as $25,000 in assistance to first-time buyers. That message could carry weight at this moment as housing costs have kept upward pressure on the consumer price index. Shelter costs are up 5.1% over the past 12 months, compared to overall inflation being 2.9%, according to the Bureau of Labor Statistics.

“Vice President Harris knows we need to do more to address our housing crisis, and that’s why she has a plan to end the housing shortage” and will crack down on “corporate landlords and Wall Street banks hiking up rents and housing costs,” said Dan Kanninen, the campaign’s battleground states director.

The Harris plan would create tax breaks for homebuilders focused on first-time buyers and expand incentives for companies that construct rental housing. Because local zoning often restricts the supply of homes, she would also double the available funding to $40 billion to encourage local governments to remove the regulations that prevent additional construction.

Although Trump made his reputation as a real estate developer, data shows that there was a shortage of available housing during his presidency.

That shortage became more problematic when inflation jumped as the country recovered from the pandemic and faced higher food and energy costs after Russia’s invasion of Ukraine. The high inflation damaged the approval ratings of President Joe Biden, whom Republicans and some economists blamed for sparking the price run-ups with his pandemic aid.

Mortgage rates climbed to levels that were prohibitively high for many would-be buyers. At the same time, many homeowners held off on listing their properties for sale in ways that compounded the inflation challenge.

Trump has floated an array of ideas for lowering housing costs — including his suggestion in a June speech in Wisconsin that stopping illegal immigration would reduce demand for housing and bring down prices.

“I will also stop inflation by stopping the invasion, rapidly reducing housing costs,” Trump said.

There is also the possibility of opening up more federal land for home construction, with the Trump campaign proposing a competition to charter as many as 10 new cities.

The Trump campaign has also opposed efforts by Democrats to encourage the construction of apartments and condominiums in suburbs and cities, which could alleviate the housing shortage. Trump has said in a video that such efforts are “Marxist” and would be a “war on the suburbs” that would destroy property values.

Still, Trump’s main play has been to claim that Harris can’t pay for her housing agenda. That’s even though he attacks her for supporting tax increases and other revenue raisers proposed by Biden that could in theory offset the costs.

“She has no clue how’d she paid for $25,000 to every first-time homebuyer, including illegals,” Trump said at an Aug. 19 rally in York, Pennsylvania, claiming without clear evidence that her policy would support immigrants without legal status.

Meanwhile, more than 200 staffers for four previous GOP presidential nominees have endorsed Harris’ White House bid, cautioning that the notion of a second term for Trump is “simply untenable” and “will hurt real, everyday people.”

In an open letter, first written about Monday by USA Today, 238 people who worked for President George H.W. Bush, President George W. Bush, Arizona Sen. John McCain and Utah Sen. Mitt Romney call on their fellow “moderate Republicans and conservative independents” to join them in backing Harris and her running mate, Minnesota Gov. Tim Walz, over Trump and his vice presidential pick, Sen. JD Vance of Ohio.