"The force from which the sun draws its power…"

The President was misinformed, or what is more likely, he forgot what he was told. The energy of the sun derives from the fusion of nucleii of hydrogen atoms to form heavier elements. This is the principle of the hydrogen bomb.

The bombs dropped on Hiroshima and Nagasaki were fission bombs in which the nucleii of very heavy elements such as Uranium 235 split into lighter elements.

Both nuclear fusion and fission liberate energy.