The House Democrats' campaign arm is taking aim at Republican incumbents in four districts in new ads unveiled Tuesday.

The Democratic Congressional Campaign Committee (DCCC) ads target Reps. Rodney Davis Rodney Lee DavisHouse passes legislation to boost election security research House Republicans investigating California secretary of state's contract with Biden-linked firm House Democrats' campaign arm releases ads hitting 10 Republicans on health care MORE (R-Ill.), Lee Zeldin Lee ZeldinDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program Overnight Defense: House panel probes Pompeo's convention speech | UN council rejects US demand to restore Iran sanctions | Court rules against Pentagon policy slowing expedited citizenship The Hill's 12:30 Report: Republicans conduct in-person convention roll call MORE (R-N.Y.), Brian Fitzpatrick Brian K. FitzpatrickHopes for DC, Puerto Rico statehood rise Florida Democrat introduces bill to recognize Puerto Rico statehood referendum DCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program MORE (R-Pa.) and Adam Kinzinger Adam Daniel KinzingerFox News reporter defends confirming Atlantic piece despite Trump backlash: 'I feel very confident' GOP lawmaker defends Fox reporter after Trump calls for her firing Lindsey Graham: 'QAnon is bats--- crazy' MORE (R-Ill.), all of whom are on the DCCC's "retirement watch list," according to a statement first obtained exclusively by The Hill.

The four congressmen were added to the group's list earlier this month.

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"These ads serve to remind Congressmen Davis, Kinzinger, Zeldin, and Fitzpatrick of the better life so many of their colleagues are choosing, rather than return to life in the minority in Washington," DCCC spokesman Cole Leiter said in a statement.

The Cook Political Report rates Zeldin, Davis and Fitzpatrick's districts as competitive districts that lean Republican. Kinzinger represents Illinois's 16th Congressional District, which is not listed as a competitive race on the Cook Political Report.

News of the ads come as Democrats look to expand their majority in the House in 2020, while Republicans aim to take back the majority in the lower chamber despite a recent wave of retirements.

A number of House Republicans have announced they will not seek reelection in 2020, including Reps. Will Hurd William Ballard HurdHillicon Valley: Oracle confirms deal with TikTok to be 'trusted technology provider' | QAnon spreads across globe, shadowing COVID-19 | VA hit by data breach impacting 46,000 veterans House approves bill to secure internet-connected federal devices against cyber threats House Democrats' campaign arm reserves .6M in ads in competitive districts MORE (R-Texas), Susan Brooks Susan Wiant BrooksBipartisan lawmakers call for broadband expansion to eliminate inequities The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week MORE (R-Ind.) and Rob Woodall William (Rob) Robert WoodallHouse Democrats' campaign arm reserves .6M in ads in competitive districts Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Democrats go big on diversity with new House recruits MORE (R-Ga.).

The retirements have sparked fear in GOP circles that party will be put on the defensive and that more exits could be on the horizon.