It took a big money push from the Republican Party, tweets by the president, and the support of the state's current and former governors, but the GOP held onto an Arizona US House seat they would have never considered endangered in any other year.

Tuesday's narrow victory by former state Sen. Debbie Lesko (R) over a Democratic political newcomer sends a big message to Republicans nationwide: Even the reddest of districts in a red state can be in play this year. Early returns show Ms. Lesko winning by about 5 percentage points in Arizona's 8th Congressional District where President Trump won by 21 percentage points.

"Debbie will do a Great Job!" Mr. Trump tweeted Wednesday.

The former state senator defeated Hiral Tipirneni, a former emergency room physician who had hoped to replicate surprising Democratic wins in Pennsylvania, Alabama, and other states in a year where opposition to Trump's policies have boosted the party's chances in Republican strongholds.

Republican political consultant Chuck Coughlin called Tuesday's special election margin "not good" for national Republicans looking at their chances in November.

"They should clean house in this election," said Mr. Coughlin, longtime adviser to former Arizona Gov. Jan Brewer (R). "There's a drag on the midterms for Republican candidates that's being created by the national narrative. And it would be very hard to buck that trend if you're in swing districts, much less close districts, if you can't change that narrative between now and November."

Lesko replaces former Rep. Trent Franks, a Republican who resigned in December amid sexual misconduct allegations. A former aide told The Associated Press that he pressed her to carry his child as a surrogate and offered her $5 million.

The district sprawls across western Phoenix suburbs, covering some of the most conservative areas of the red state, including the retirement community of Sun City.

At a victory party in her Glendale, Ariz., neighborhood, Lesko greeted supporters and looked back in wonder.

"I've really come a long way and this is really quite overwhelming, it's very surreal," she said. "Twenty-five years ago I left an abusive husband and I sure as heck never would have dreamt in a million years that I would be running for Congress to be a congresswoman."

Former Governor Brewer, who backed Lesko and was at her victory party, also warned that Republicans need to make changes if they want to hold the district and other seats in November elections.

"I think all Republicans need to wake up and listen to what the public wants," she said. "Before November, we're going to have to work very hard. We're going to have to listen to our constituents."

Ms. Tipirneni worked the district hard, making inroads rarely seen in an area that hadn't elected a Democrat since the early 1980s. She was seen as a fresh Democratic face with relatively moderate views that could get support in the district. Making a push for older voters, she had said Lesko would vote to go after entitlement programs like Social Security and Medicaid to pay for tax cuts that mainly benefit the wealthy. She's pushed a plan to allow some people to buy into Medicare.

Tipirneni said she plans to run in November's general election and told supporters not to give up the cause. She said that despite the big Republican advantage in the district, the results show people were ready for a change.

"We have a very short amount of time, and clearly Ms. Lesko she had the registration numbers a little bit in her favor and she also had the name recognition," Tipirneni said. "But given more time I know we can get more folks on our side."

The Associated Press called the race for Lesko after state officials released tallies of more than 155,000 mail-in ballots, which represent about 75 percent of the votes expected.

National Republican groups spent big to back Lesko, pouring in more than $500,000 in the suburban Phoenix district for television and mail ads and phone calls to voters. On Election Day, Trump and current Arizona Gov. Doug Ducey (R) urged Republicans to go to the polls and vote for Lesko. National Democratic groups, meanwhile, didn't commit money to the race, a sign they didn't believe the seat was in play.

Several Republican voters who spoke with AP said they backed Lesko primarily because she supported Trump's border security plans.

David Hunt, a retired construction and warehouse worker from Glendale, said he cast his vote Tuesday for Lesko because he believed that immigrants in the country illegally are creating unfair competition for jobs for recent high school students in Arizona.

"She's the best candidate to deal with the porous border," Mr. Hunt said.

His views were echoed by Larry Bettis, a retiree from Glendale.

"Immigration – the fence," Mr. Bettis said. "That's all I really care about."

Democrats said they wanted to send a message to Trump and supported Democratic health care plans.

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"I don't like the president and felt it was time to take a stand," said Nikole Allen, a medical assistant from New York now living in Glendale. "It's time for us to vote the Republicans out."

This article was reported by The Associated Press.