New warnings Labor day crowds worsen COVID-19 surge; United States helps 4 Americans escape Afghanistan by crossing border; video shows failed rescue of 2-year-old and parents from flooded basement 7-day average of new COVID-19 cases up 300% sine last Labor day; Fauci: Pfizer booster likely ready by September 20 roll out: Monderna boosters may be delayed; Fauci: Three vaccine doses likely needed for full protection;
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The Situation Room with Wolf Blitzer and Pamela Brown