With all the chaotic political, economic and national security messes/crises that President Joe Biden has created in America and abroad since he took office in January 2021, one has to wonder about his competence -- and that of all his advisors and cabinet members -- and whether he is capable of fulfilling his duty.
Need I say more...
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N.B. How the events unfolded the morning of 9/11 are detailed at this link.