Republicans are entering the final days of the campaign with a message they hope will win over wavering suburban voters — the economy is booming, don’t let Democrats ruin it — while echoing President Trump in stoking fears about undocumented immigrants to try to rile the GOP base.

Democrats are focused on female and independent voters angry with Trump, minorities and young people, hoping that coalition will turn out for the midterms and propel them to victory. The party has been especially focused on health care, warning that Republicans threaten a core provision of the Affordable Care Act — the protection for Americans with preexisting medical conditions.

Control of the House and Senate, along with 36 governorships, is at stake in Tuesday’s elections. The House majority will be determined in dozens of suburban districts across the country, while the future of the Senate is up for grabs in Republican-leaning states where Trump won in 2016 and his support is solid among rural voters.

In those suburban districts, the question is whether swing voters go with their wallets — the months of positive economic news of job and wage growth — or concerns about their health care.

“A booming economy or the radical policies of the liberal mob — that’s our choice,” says one GOP ad running on behalf of Rep. Steve Chabot (R-Ohio), who represents the Cincinnati area.

Meanwhile, in the Chicago area, Democrats are blasting Rep. Peter J. Roskam (R-Ill.) with an ad showing a child in a hospital bed: “Imagine watching him going without lifesaving treatment because it’s been denied by your insurance. That’s what Peter Roskam voted for.”

House Minority Leader Nancy Pelosi (D-Calif.) speaks to volunteers at a get-out-the-vote event for Florida Democratic congressional candidates, with Donna Shalala, left, and Debbie Mucarsel-Powell on Oct. 17 in Coral Gables. (Wilfredo Lee/AP)

House Minority Leader Nancy Pelosi (D-Calif.) said health care has been paramount, reflecting a concerted Democratic effort that started in the days after Trump’s election to preserve the ACA from Republican attempts to scrap or gut the law.

“It’s dominant because it’s dominant in the well-being of people’s lives,” she said in an interview Saturday. “It’s also dominant because we made it so.”

A Washington Post-ABC News national poll published Sunday found Democrats with a seven-point national advantage among likely midterm voters, which is in the range forecasters predict is necessary to flip control of the House. The lead is driven by an educational divide: Those with college degrees heavily favor Democrats.

The picture is more favorable for Republicans in the Senate, where Democrats are defending 10 seats in states Trump won. Many of those states are predominantly white and lean Republican, and Trump’s comments on immigrants resonate.

John Rogers, executive director of the National Republican Congressional Committee (NRCC), predicted that the threat of a Democratic “resistance mob mentality” that would impede the Trump agenda, as well as policy proposals supported by some on the left, will swing persuadable voters and save the GOP’s eight-year House majority.

“I think the voters are out there seeing all this and saying, ‘Maybe I want a check and balance, but this is not what I want. This isn’t the check and balance,’ ” Rogers said.

Trump repeatedly casts Democrats as an angry mob while ratcheting up his false claims about the party wanting to allow millions of undocumented immigrants into the country, including the thousands who are part of a migrant caravan slowly heading toward the border.

He also has proposed to end birthright citizenship for the children of undocumented immigrants.

Other Republicans have joined Trump in seeking to energize the base with dark images of immigrants and references to the caravan.

In Tennessee, GOP Rep. Marsha Blackburn is airing images of the caravan alongside video of her Democratic opponent for a Senate seat, Phil Bredesen, saying the migrants are “not a threat to our security.”

Trump’s “doing that because they have nothing else to talk about,” said Dan Sena, director of the Democratic Congressional Campaign Committee (DCCC). “The country does not support their tax package, and the country does not trust them on health care.”

Meanwhile, in Nevada, a Democratic super PAC is bombarding Sen. Dean Heller (R) with a spot saying he “puts his political party over your health care” and warning that GOP leaders are eyeing Medicare cuts.

Late TV spending for the DCCC and the House Majority PAC, the biggest Democratic groups focused on House races, are overwhelmingly promoting messages targeting Republican health-care policy and last year’s GOP tax bill, which Democrats are arguing will prompt cuts to Social Security and Medicare.

In New York’s 22nd Congressional District, Democratic ads have been hammering GOP Rep. John Faso for months, highlighting video of him promising to protect health coverage for people with preexisting conditions.

“John Faso broke his promise,” a DCCC ad says. “It’s time for him to go.”

A key figure in the GOP messaging continues to be Pelosi, who is seeking to become speaker if Democrats win a majority. Of 16 ads debuted in the past week by the NRCC, 10 mention Pelosi or feature her image. An additional half-dozen spots aired by a major GOP super PAC, the Congressional Leadership Fund, also feature Pelosi.

“Your vote decides if Pelosi becomes speaker again,” says one NRCC ad running against candidate Elissa Slotkin of Michigan, calling a vote for Slotkin “a vote for Pelosi’s agenda — for tax hikes, for amnesty, for chaos.”

Democrats, meanwhile, are waging a perennial struggle to reach Democratic voters who tend to vote in presidential elections but not midterms — many of them African American, Hispanic and young.

The group launched a $30 million engagement campaign specifically targeting those groups — an effort that began days after Trump’s win in 2016.

Early-voting data, Sena said, indicated that the Hispanic share of the overall vote was more in line with the 2016 presidential year than the 2014 midterm year. That kind of Latino turnout, he said, “really paves the way for us to win the House in multiple different ways.”

The DCCC’s national advertising efforts include multistate ads running on African American radio stations and on Spanish-language television. Those ads, Sena said, feature a positive message aimed at inspiring, rather than scaring, voters.

Rogers, the NRCC leader, acknowledged that the immigration issue has been “largely base-motivational” but said his group also has been focused on persuading married, college-educated women, a demographic that has turned sharply away from Trump.

“The voters don’t have one No. 1 issue that is driving this election,” he said. “I think it’s what’s caused this to be a very volatile election cycle all the way to the end, which is where we are now, and I think these good economic numbers are going to be really good for us going in the close here.”

The widely seen bounce in GOP voter energy around the confirmation of Supreme Court Justice Brett M. Kavanaugh earlier this month might have faded somewhat, Rogers said, but it has improved the party’s fortunes in key races.

“We’re now back into fighting out each of these individual races on their own terms,” Rogers said.

Rogers and Sena spoke with a Washington Post reporter Friday for an episode of C-SPAN’s “Newsmakers” that aired Sunday.