The CDC says that the U.S. coronavirus death toll could reach 180,000 by end of August, President Trump renews attacks on mail-in voting despite no evidence it leads to fraud, and Florida braces for Hurricane Isaias while battling the pandemic.Watch NBC Nightly News With Lester Holt at 6:30 p.m. ET 5:30 p.m. CT (or check your local listings).00:00 Intro01:27 CDC: U.S. Covid-19 Death Toll Could Top 180,000 By End Of August01:58 Dr. Fauci: 'Cautiously optimistic' Will Have Vaccine By End Of Year, Early 202104:19 HHS:75% Of Test Results Coming Back Within 5 Days04:56 Many New Infections Being Driven By Gatherings Among Young People, Authorities Say05:24 Study: Colleges May Need To Test Students Every 2 Days To Open Safely07:06 Trump Warns Of Greatest Election Disaster In History08:23 White House, Democrats Far Apart As Enhanced Unemployment Benefits Expire08:55 Hurricane Hits Caribbean, Threatens Florida Coast, Eastern Seaboard11:00 1 Marine Dead, 8 Missing After Training Accident Off Ca Coast12:03 FBI: 3 People, INCLUDING 17-Year-Old, Arrested In Twitter Hack13:39 Court Overturns Boston Marathon Bomber's Death Sentence14:15 Documents Reveal New Details In Case Involving Epstein's Alleged Accomplice16:16 U.S. Marshals On Clashes Between Protesters, Federal Agents18:23 Global Concerns That U.S., Europe Will Buy Up Covid-19 Vaccine Supply19:00 Inside Plan To Get Covid-19 Vaccine To Every Country