Fla. extends emergency declaration to all counties; British soldiers brave brutal heat waves. Source

Hurricane Dorian expected to hit Florida as Category 4 storm; The Queen’s Guards try not to faint as temperatures soar. Source

The first and second Democratic presidential debates took place over two nights each. Half the candidates did not meet the party’s threshold to qualify for the third debate Source

Simona Halep of Romania took the first round 6-2, but Townsend came back to win the next two sets 6-3, 7-6 Source

A new report by the Justice Department’s internal watchdog found James Comey violated FBI policy by sharing memos detailing his private conversations with President Trump. But the department will not prosecute Comey. Paula Reid reports. Source

Jennifer Horn, former chairwoman of the New Hampshire Republican Party, joins CBSN’s “Red & Blue” to discuss why she recently left the board of the Log Cabin Republicans. She says there’s “no way” she could endorse President Trump for reelection. Source

President Trump held a Rose Garden event to commemorate the establishment of the U.S. Space Command Thursday, as the president pushes for the creation of his sixth branch of the military, the Space Force. CBS News’ Bofta Yimam reports. Source

The ongoing trade war between China and the United States is causing whiplash on wall street and anxiety among some American voters. 2020 Campaign reporters Musadiq Bidar and Nicole Sganga were on the ground in the early voting states of Iowa and New Hampshire. They joined CBSN for Thursday’s edition of 2020 Daily Trail Markers. Source

CBS News campaign reporter Adam Brewster joins CBSN’s “Red & Blue” to discuss why the DNC is concerned about plans for virtual caucuses in Iowa and Nevada. Source

U.S. officials are reportedly concerned about a ransomware attack against the 2020 election. CNET senior producer Dan Patterson joins CBSN’s “Red & Blue” to discuss how cities and towns across the country are protecting their information. Source