Republican Ted Gradel, who is challenging freshman Rep. Lauren Underwood Lauren UnderwoodObama announces first wave of 2020 endorsements The Hill's Coronavirus Report: GoDaddy CEO Aman Bhutani says DC policymakers need to do more to support ventures and 'solo-preneurs'; Federal unemployment benefits expire as coronavirus deal-making deadlocks The Hill's Coronavirus Report: iBIO Chairman and CEO Thomas Isett says developing a safe vaccine is paramount; US surpasses 150,000 coronavirus deaths with roughy one death per minute MORE (D-Ill.) for the Illinois House seat she flipped last year, has raised more than $150,000 in the six days since he announced his candidacy, his campaign said Tuesday.

The six-figure haul is the latest sign that Underwood is likely to face a tough reelection fight next year as she looks to hold on to a congressional district that flipped to Democrats in 2018 despite President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s nearly 4-point win there in 2016.

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Gradel, a former University of Notre Dame field goal kicker and first-time candidate for public office, announced his bid for the suburban and exurban Chicago district last week in a video narrated by former Notre Dame football coach Lou Holtz.

In declaring his candidacy, Gradel joined a growing field of Republicans targeting Underwood in 2020.

Among the other announced contenders are Illinois state Sen. Jim Oberweis, Danny Malouf and Anthony Catella.

"Sarah and I are humbled by the great support we’ve received in just the first few days, and I look forward to working hard to win this campaign and make a change in Washington,” Gradel said Tuesday. “I am especially grateful to the members of our finance committee for their support.”

Underwood, a former nurse who worked in the Obama administration, ousted former four-term Rep. Randy Hultgren Randall (Randy) Mark HultgrenRepublican challenging freshman Dem rep says he raised 0,000 in 6 days Illinois Dems offer bill to raise SALT deduction cap The 31 Trump districts that will determine the next House majority MORE (R-Ill.) in last year’s midterms, scoring a win that helped power the Democratic “blue wave” that pushed the party into power in the lower chamber.

Republicans are eager to win the district back, hoping that two years of divided government in Washington and having Trump on the ballot will fuel GOP gains in districts that recently flipped.

Still, Underwood is likely to enter 2020 with a well-financed campaign of her own. She raised $342,000 in the first quarter of 2019, ending March with more than $250,000 in the bank, according to her most recent filing with the Federal Election Commission.

The Cook Political Report, a nonpartisan election handicapper, currently rates the race for Illinois’s 14th District as a “toss-up.”