NBC Nightly News anchor Lester Holt is starting the week in Houston as part of the network’s week-long special coverage on the state of the climate crisis. The network-wide series “Climate Challenge” will include exclusive reporting on TODAY, NBC Nightly News, Meet the Press, and NBCNews.com.

FILE - "NBC Nightly News" anchor Tom Brokaw delivers his closing remarks during his final broadcast, in New York on Dec. 1, 2004. Brokaw says he is retiring from NBC News after working at the network for 55 years. (AP Photo/Richard Drew, File)(AP) – Longtime NBC News anchor Tom Brokaw, once television news' most popular broadcaster as he told viewers about the biggest events of that late 20th Century, said Friday that he's retiring from television. In 2013, Brokaw was diagnosed with multiple myeloma, an incurable blood cancer that affects the bone marrow. Brokaw said the coronavirus pandemic, which has killed more than 400,000 Americans in the past year, was the country's greatest test since the Civil War.