Isolationist America First group blasted FDR as "warmonger" and "interventionist".
With the attack on Pearl Harbor, a collapse of isms
That day, the entire AFC cause collapsed on the Soldiers & Sailors floor, felled by the same foe that crippled the Pacific fleet. Three ideological isms collided that day: Japanese imperialism aroused American nationalism and, in the process, silenced American isolationism.
In the 15 months before the outbreak of World War II, the America First Committee dominated the national isolationist discussion. Its policies were: defend our shores, denounce FDRs interventionist agenda and oppose aid to Britain in its war against Hitler. The AFC emerged to counter the interventionist Committee to Defend America by Aiding the Allies.
Prior to Mr. Nyes address, the Bellevue Methodist Church choir performed several selections, and speakers stoked the crowd. Among the group was former state Sen.C. Hale Sipe, who referred to FDR as the chief warmonger in the United States.
Mr. Nye glanced at the note and, without pausing, continued to harangue his audience. He asked, Whose war is this? The thunderous response reverberated throughout the hall: Roosevelt! Roosevelt! For another 15 minutes, his assault on the administration continued. Mr. Nye denounced FDRs arrangement with Britain to exchange 50 destroyers for leases on eight Western Hemisphere bases. Some listeners responded with cries of Treason, and others shouted, Impeach him.
http://www.post-gazette.com/opinion/Op-Ed/2014/11/30/The-Next-Page-With-the-attack-on-Pearl-Harbor-a-collapse-of-isms/stories/201411300177