Liz Cheney rallies support for Harris in Wisconsin. Plus, Kamala Harris is endorsed by 700+ bipartisan national security leaders. Also, Senator Tammy Baldwin faces Trump-backed Eric Hovde. Susan Rice, Sen. Tammy Baldwin, Simon Rosenberg, and Stuart Stevens join Lawrence O'Donnell.

Donald Trump's rambling speeches renew questions about his age. Also, the Supreme Court declines to hear the Biden administration's appeal in the Texas emergency room abortion case. And Dr. Anthony Fauci recounts his near-death experience of contracting West Nile virus in his backyard. Mary Trump and Rep. Colin Allred also join Lawrence O'Donnell.