He repeats it because he is a brain dead puppet more concerned where his next sniff is coming from than being competent. Besides, at this point in his dementia, all he can do is read words off a teleprompter, and even HE SUCKS AT THAT!
Second Amendment:
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
WHAT PART OR WORD DOES BIDDEN NOT UNDERSTAND????