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 GarrettHuizenga to chair influential subcommittee overseeing Wall Street Congress asserts itself The Hill's 12:30 Report MORE (N.J.), Dean HellerDean HellerRed-state Dems in Supreme Court pressure cooker This week: House GOP faces make-or-break moment on ObamaCare Shutdown politics return to the Senate MORE (Nev.), Charlie Dent (Pa.) and Cynthia LummisCynthia LummisTrump's Interior candidates would play Russian roulette with West Trump eyes House members for Cabinet jobs Trump aide dodges questions about business dealings 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.