In 2014, Kaine argued that the U.S. military intervention against Islamic State of Iraq and the Levant (ISIL) undertaken by Obama was unconstitutional without a new congressional authorization for the use of military force against ISIL. In November 2014, at the Halifax International Security Forum, Kaine and McCain emphasized the necessity of such a congressional authorization, saying: "You just can't have a war without Congress. You can't ask people to risk their lives, risk getting killed, seeing other folks getting killed or injured if Congress isn't willing to do the job to put their thumbprint on this and say, this is a national mission and worth it." After the April 2017 Shayrat missile strike in Syria, ordered by Trump, Kaine said, "There is no legal justification for this. He should not have done this without coming to Congress." On "Meet the Press", Kaine said, "I'm a strong supporter that the U.S. should take action to protect humanitarian causes, like the ban on chemical weapons. Where I differ from this administration, and I took the same position with respect to President Obama, we are a nation that's not supposed to take military action, start war, without a plan that's presented to and approved by Congress."