Capricious inconsistency can destabilize the party a leader nominally heads.

Evidence

Trump is consistent only in his inconsistency—his capricious passing preferences, his frustrations and reversals, and his conspiracist distortions of political reality. He leaves Republicans (and everyone else) flummoxed and at odds. One day, he urges members of Congress not to pass any immigration bill and rather to wait until after the midterm elections, when more Republicans will have been elected. Five days later, he urges—via an ALL CAPS tweet—those same members of Congress to pass a comprehensive immigration reform bill. An organized Republican Party with a recognizable political identity may not survive his presidency. — Russell Muirhead and Nancy L. Rosenblum, A Lot of People Are Saying, 182