Article V does indeed legally obligate the U.S to go to war. There's no way around that because the Treaty and its obligations were lawfully ratified by the Senate.
What he should have said is that Congressional action would still be required for us to act on that obligation, which is probably correct.
100% false...and shame on you for presuming American sovereignty can usurped like that.
You’re wrong.
“Article 5,
The Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all and consequently they agree that, if such an armed attack occurs, each of them, in exercise of the right of individual or collective self-defence recognised by Article 51 of the Charter of the United Nations, will assist the Party or Parties so attacked by taking forthwith, individually and in concert with the other Parties, such action ***AS IT DEEMS NECESSARY***,including the use of armed force, to restore and maintain the security of the North Atlantic area.”
It’s an authorization, not a requirement.