In Lebanon, the health ministry is calling on citizens to be on "high alert" after devices belonging to members of Hezbollah suddenly exploded. Several people have been killed and thousands injured, including Iran’s ambassador to Lebanon, according to Iranian state media. Hezbollah said it holds Israel responsible for the attack and vowed retribution. Christiane gets the latest from Lebanese journalist Kim Ghattas.?

Also on today's show: US Senate Democrat Chris Murphy; "Borderland" Director Pamela Yates & human rights activist Gabriela Casta?eda; presidential historian Timothy Naftali?