"No president likes to have his own party argue with him," said former House Speaker Newt Gingrich, who's also an informal Trump adviser. He said Republicans have legitimate concerns with Trump about the decision, including the lack of advance notice.
But by disagreeing with Trump over Syria, "they're proving they are independent" of him, said Gingrich, who led the 1998 investigation to impeach former President Bill Clinton. "They're proving that they're not automatically going to do what Trump wants."