we'll talk about that with sports marketing legend tony ponturo and robert bolin. donald trump showing the republican party he is loyal to the party. the billionaire populist conservative signing a pledge, ruling out a third party or independent run. the move comes after polls make it increasingly clear he is likely to win this nomination. fox news chief political correspondent carl cameron with our report. >> reporter: donald trump signed the republican national committee loyalty pledge to not run as an independent or third-party candidate and back whoever wins the gop nomination. >> i will be totally pledging my allegiance to the republican party, and the conservative principles for which it stands. >> raise your hand now if you won't make that pledge tonight. >> reporter: only trump declined taking such a pledge during the fox debate last month. trump met with the republican national committee chairman reince priebus, trump denied any deal for his pledge and had no intention of changing his mind. >> i'm not controlled by lobbyists. i'm not controlled by anybody.