Democrats Embrace Kamala Harris as Presidential Nominee to Beat Donald Trump; China Brokers Agreement Between Hamas and Fatah to End Division; Dozens Killed and Thousands Flee Amid IDF Operations; Secret Service Director Resigns Amid Security Lapse Scrutiny. Examining Stark Policy Differences Between Harris, Trump; Police Fire Tear Gas at Protestors in Kenya; Paris Battles Air Pollution to Keep Olympic Athletes Healthy. Aired 12-1a ET

[00:00:34] JOHN VAUSE, CNN INTERNATIONAL ANCHOR: Ahead here on CNN NEWSROOM. (BEGIN VIDEO CLIP) KAMALA HARRIS, VICE PRESIDENT OF THE UNITED STATES: We've got some work to do. (END VIDEO [...]