A large portion of Trump's base are very unhappy about bombing Iran and are very critical of any comments that are pro-war in general. I see it in a lot of comments sections and social media message to the effect of "I voted for Trump, and I didn't vote for this (war in Iran)".

Generally, Any prominent pro-Israel republican if they post anything pro-war will have hundreds of negative replies.

It is incredibly depressing to see people constantly falling into the trap that their political opposition are dumb / brainwashed.