Factlet of the Day

I'm currently reading (among other things) Atomic Obsession, and really enjoying it so far. One thing that Mueller mentions, kind of as an aside, has to do with the sheer amount of stuff that the US supplied to the USSR during WW2.

I knew the US helped supply the USSR with supplies during WW2, but didn't know we supplied them with (on average) 1/2 lb of food per day per Soviet soldier for every day of the war, largely in the form of Spam. True story.

Question

It was claimed by someone I encountered today that:

a) the US "could have nuked Germany" during WW2
b) the US never really seriously considered nuking Germany

Given that the first nuclear test was in the summer of '45, after VE Day had already taken place, I was skeptical of this person's argument. Could any reader help me out with this?