Iran Contra, easily the gravest presidential scandal in American history
No, the gravest presidential scandal in American history is the intentional and premeditated delivery of half of Europe to Stalin and all of China to "so-called Communist" and "agrarian reformer" Mao.
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Okay, I'll bite. What evidence do you have to suggest:
1A. the Soviet Union's assumption of dominion over Eastern Europe after WW2 was primarily the result of specific action(s) taken by the US President?
1B. the above action(s) had a specific and intentional goal of accomplishing this outcome?
1C. this outcome was deliberately sought in advance by the US President?
2A. the Communist victory in the Chinese Civil War was primarily the result of specific action(s) taken by the US President?
2B. the above action(s) had a specific and intentional goal of accomplishing this outcome?
2C. this outcome was deliberately sought by the US President?
I do think one can argue that there was a naive approach to the USSR from the US administration during the last stages of WW2 where they didn't really jockey for as good a position as possible. I've read (though I'm no expert) that it wasn't really until the Berlin blockade and the Prague coup that the US properly realized that there was a Cold War going on.
It's obviously laughable that they could have prevented a USSR takeover of all of Eastern Europe but maybe they could have saved more than they did.