A source tells CNN former Vice President Pence’s Chief of Staff Marc Short testified last week in front of a federal grand jury investigating the January 6 attack on the Capitol. Former federal prosecutor and CNN Chief Legal Analyst Jeffrey Toobin tells Anderson Cooper why Short testifying is a “big deal.” Plus, after a weekend filled with extreme, record breaking heat in the Northeast, CNN Correspondent Gary Tuchman brings AC360 to the hottest place on Earth: Death Valley, California to see what life is like when summer temperatures often top 120° F. To learn more about how CNN protects listener privacy, visit cnn.com/privacy