DUBLIN, N.H. -- Sen. Ted Cruz (R-Tex.) on Friday declined to back fellow Texas Republican Sen. John Cornyn's bid for reelection in 2014, saying that he will probably steer clear of all races in which incumbents face primary challengers.

Cruz called Cornyn a "good man" and a "friend," but would not back the Senate minority whip.

"I think it is likely that I am going to stay out of incumbent primaries across the country, either supporting incumbents or opposing incumbents," Cruz told reporters.