First a cold, then bad prep, and now jet lag.Biden's campaign has put forth a series of reasons trying to explain his bad debate performance.This comes as pressure has grown for Biden to step aside and make way for a replacement.

Lloyd Doggett on Tuesday became the first Democratic lawmaker to break ranks and demand Biden step aside, top party figures are now asking for more openness and details on the president’s health and mental state as the anxiety about his reelection campaign evolves into an increasingly genuine threat to his grip on the Democratic nomination.

Despite the campaign’s effort to stem criticisms, the first congressional Democrat called for the president to step aside as party nominee.