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 Marie BachmannBachmann praises Trump as man of faith Tom Petty dies at 66 Bachmann: Muslim immigrants trying to undermine Western civilization MORE (Minn.), Blaine Luetkemeyer (Mo.), Lee Terry (Neb.), Scott GarrettErnest (Scott) Scott GarrettScott Garrett poses real threat to EXIM Bank, small businesses Overnight Finance: Trump repeals consumer arbitration rule | GOP scrambles on tax bill | Trump floats repealing ObamaCare mandate in tax bill | Powell told he'll be picked for Fed chair | Fed holds off on rate hike | Bank nominee gets rough reception Manufacturers increase pressure against Ex-Im nominee Garrett MORE (N.J.), Dean HellerDean Arthur HellerAnother perfect storm: Why we must act before flood insurance runs dry Senators introduce bipartisan gun background check bill Dem PAC bullish on Senate chances 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.