None. In the Korean War General MacArthur requested authorization. President Truman not only turned him down but also fired him!
President Donald Trump!!!!
Truman in WW2 on Japan.
Harry Truman - August of 1945
nuclear bomb
The meaning of the word nuclear weapon, is a weapon that has a nuclear warhead on it.
Two nuclear weapons were used -- the Little Boy, a gun-type uranium-fueled nuclear weapon that was deployed against Hiroshima on Monday, August 6, 1945. The second was the Fat Man, an implosion-type plutonium-fueled nuclear weapon deployed against Nagasaki on Thursday, August 9, 1945.
Originally as a defense against Nazi Germany possibly making one.
Massive retaliation -apex
This nuclear weapon is called an atomic bomb or a nuclear bomb
Nuclear weapon detonations
If by "bomb" you mean a conventional explosive weapon, then the nuclear weapon is more powerful.
To defend against someone else having them. Same as any other weapon.