He wasn't on the Council. But what he was was a Jedi, who left their order. Yes, they knew him, but it was their overconfidence in thinking that he wouldn't turn at this late a stage. The Loyalist Committee is against having an army period. They believe that by creating an army to fight for the Republic, they're turning their back on everything that the Republic stood for, for a thousand years. PADME: "What if the democracy we thought we were serving no longer exists, and the Republic has become the very evil we have been fighting to destroy?" ANAKIN: "I don't believe that. And you're sounding like a Separatist!" PADME: "Anakin, this war represents a failure to listen . . . Now, you're closer to the Chancellor than anyone. Please, please ask him to stop the fighting and let diplomacy resume." They opposed the army so that peaceful talks could continue and as the war was ending, she wanted push for a return to the status quo. That's why Bail is upset as the Grand Army Of The Republic is being deployed at the end of AOTC. Diplomacy is gone and now they're fighting a senseless war with many casualties. She'd rather negotiate than fight. And she was right in the end. That shows you how screwed up the Jedi were. They couldn't consider the possibility that Dooku changed in ten years, whereas Padme considered the attack was someone other than disgruntled miners.