During WWI Churchill desparately wanted arms from the US. The US military was not yet able to provide same.
The Republicans, in congress were not fully supportive of the war,, or of shipping ams to support Britain.
American pilots joined the Canadian AF, to ferry planes to Britain.
The American public were not fully supportive until Pearl Harbor, Hitler declares war etc.
In those days, FDR was out on a limb, leading to help our ally GB as best he could. He probably bent some rules.
It was the Obama admin denying arms to Ukraine, not Trump.
Trump eventually provided arms to Ukraine, and Ykraine did NOT investiate Bidens.
I suggest that some here, need to replace your daily quests for Trump "gotchas," with some actual knowledge of history, deiplomacey, leadership, etc.