If Donald Trump and Vice President Kamala Harris take part in a second presidential debate, it could reveal more about the former president’s “mental acuity” and “cognitive fatigue,” a MSNBC analyst said Saturday. Alexi McCammond, who also serves as an opinion editor focusing on the 2024 election for the Washington Post, appeared on MSNC over the weekend to discuss Harris potentially debating Trump once again. After the first debate, Trump promised there wouldn’t be another, but later waffled and suggested he might consider debating again. The host asked McCammond exactly why Harris would cons…