Not so much. Here's the Republican platform of 1940. In it,, they support strong military not for war, but to deter invasion of the US. They insist the US should not enter the war. In their usual disgusting way, they try to link the issue of WWII to opposing government regulation of business:
"Our national defense must be so strong that no unfriendly power shall ever set foot on American soil. To assure this strength our national economy, the true basis of America's defense, must be free of unwarranted government interference."
Of course, the didn't want to ignore the war; they supported giving some materials and "words of reassurance and hope".
"Only a strong and sufficiently prepared America can speak words of reassurance and hope to the liberty-loving peoples of the world."
But stay out of that war:
But if FDR dared criticize Nazis or Japan, or took actions that might upset them, Republicans would condemn that risk of war:
"...we deplore explosive utterances by the President directed at other governments which serve to imperil our peace; and we condemn all executive acts and proceedings which might lead to war without the authorization of the Congress of the United States."
They addressed the crisis of fellow democracies under attack... with sympathy and some material, while pledging to stay out of the war.
"Our sympathies have been profoundly stirred by invasion of unoffending countries and by disaster to nations whole ideals most closely resemble our own. We favor the extension to all peoples fighting for liberty, or whose liberty is threatened, of such aid as shall not be in violation of international law or inconsistent with the requirements of our own national defense."
As Wikipedia describes the 1940 election: "The three leading candidates for the 1940 Republican nomination were all isolationists to varying degrees:"
While the Republican nominee did support the material aid of Lend-lease - not involvement in the war - even that was too much for Republicans.
"While on vacation, Willkie decided his next cause should be military aid to embattled
Britain, and announced support of the president's
Lend-Lease program on January 13, 1941. Lend-Lease was highly unpopular in the Republican Party, and Willkie's announcement created a firestorm, with Landon and Taft decrying his actions. Former RNC chairman Hamilton wrote that of the almost 200 Republican members of the House and Senate, "Willkie couldn't dig up ten friends if his life depended on it.""