This is false.
PS, Trump specifically called it a war.
Trump “violated the Constitution by invading Iran because the Constitution is crystal clear on who has the authority to declare war and commit American service members to battle and that is Congress alone,” said Christopher Anders, a lawyer with the American Civil Liberties Union who is an expert on national security matters.
“The president has tried to grab that power for himself without getting authorization from Congress before doing so,” Anders added.
The Constitution unambiguously states that only Congress can declare or authorize war.
“This is very obviously a war,” said Ilya Somin, a law professor at George Mason University and a scholar at the Cato Institute, a libertarian think tank. “You don’t have to take my word for that — Trump himself says it’s a war.”
“I think you could argue about the wisdom of it,” Somin said of the new US attacks. “I certainly wouldn’t shed any tears if the Iranian regime were to be overthrown. It’s an awful regime. It’s an enemy of ours and so forth, but the war that has been started here is unconstitutional.”