The National Republican Congressional Committee (NRCC) has expanded its list of vulnerable members who it will focus its incumbent retention program on.

The NRCC added 15 members to its Patriot program Wednesday, and they join the 10 members who were originally put on the list.

The new members are Reps. Mike Rogers (Ala.), Mary Bono Mack (Calif.), Bill Posey (Fla.), Tom Rooney (Fla.), Mario Diaz-Balart (Fla.), Lynn Jenkins (Kan.), John FlemingJohn FlemingCoast Guard suspends search for missing Ohio plane Freedom Caucus member to bring up bill on impeaching IRS chief GOP seeks to make it 52 MORE (La.), Bill Cassidy (La.), Michele BachmannMichele Bachmann'Real Housewives' producer 'begging' Conway to join cast Ex-rep admires furs amid PETA inaugural gala Why Republicans took aim at an ethics watchdog MORE (Minn.), Blaine Luetkemeyer (Mo.), Lee Terry (Neb.), Scott GarrettScott GarrettHeitkamp breaks with Dems on regulations Business groups silent on Trump's Ex-Im nominee Trump should work with Congress to kill the Export-Import Bank MORE (N.J.), Dean HellerDean HellerOvernight Healthcare: GOP infighting erupts over bill | How Republican governors could bring down ObamaCare repeal | Schumer asks Trump to meet with Dems GOP infighting erupts over healthcare bill Budowsky: Rising up vs. TrumpCare MORE (Nev.), Charlie Dent (Pa.) and Cynthia LummisCynthia LummisFemale lawmakers flee House for higher office, retirement Despite a battle won, 'War on Coal' far from over Dems on offense in gubernatorial races MORE (Wyo.).

Posey, Rooney, Jenkins, Fleming, Cassidy, Luetkemeyer and Lummis are all freshman. The others were targeted by Democrats in 2008, with mixed results.

There are a few curious absences from the list so far.

One is Rep. Mike Castle (R-Del.). Several of the new Patriots had opponents raise big money against them in the second quarter, and Castle did too. Take it as a sign that the party believes there's little chance he will be seeking reelection.

Another is Rep. Bill Young (R-Fla.). Young comes from a tough district and has a solid opponent, yet seemingly less vulnerable members with no opponents are still being added to the list before him. Could be a sign of retirement.