"the new survey found 56% of Americans oppose U.S. military action in Iran, while 44% support it."
But later:
"A majority -- 54% -- of Americans disapprove of how Trump is handling Iran. Another 36% approve and 10% are unsure"
36% support it.
Their reason for supporting a war but not the way Trump is doing it could range from it being too extreme to not being extreme enough. Some people unironically want nuclear weapons to be dropped and will settle for nothing less.