Former Homeland Security adviser Thomas Bossert. Photo: Mark Wilson/Getty Images

Former President Trump Homeland Security adviser Tom Bossert sounded the alarm on the rapid spike in the spread of the coronavirus in a series of tweets Sunday, saying that "Masks are important, but not enough."

Why it matters: It's a different tone than much of the Trump administration, as cases are spiking in a number of states around the country. Trump baselessly claimed during his Independence Day remarks that 99% of coronavirus cases "are totally harmless."

What he's saying: Bossert shared data on the rising number of new cases in some states...

  • "TX: Cases as of 7/4 (191.8K); cases as of 6/20 (107.7K). Increase of 84K over 2 weeks. Assuming case ascertainment of 20%, true number of cases = 416K. Population of TX = 29M, so roughly 1.4% of population is currently infectious."
  • "AZ: Cases as of 7/4 (94.6K); cases as of 6/20 (49.8K). Increase of 44.8K over 2 weeks. Assuming case ascertainment of 20%, true number of cases = 220K. Population of AZ = 7.3M, so roughly 3% of population is currently infectious."
  • "CA: Cases as of 7/4 (254.7K); cases as of 6/20 (169.3K). Increase of 85.4K over 2 weeks. Assuming case ascertainment of 20%, true number of cases = 427K. Population of CA = 40M, so roughly 1% of population is currently infectious."
  • "GA: Cases as of 7/4 (93.3K); cases as of 6/20 (63.8K). Increase of 30K over 2 weeks. Assuming case ascertainment of 20%, true number of cases = 150K. Population of GA = 10.6M, so roughly 1.4% of population is currently infectious."

The bottom line: He then shared a study by the Imperial College of London that suggests that wearing masks should be accompanied by other preventative measures to stop the spread of the virus. "Masks are important, but not enough," he wrote.

  • "What are the hundreds of thousands of infectious people in these states doing right now? Isolating? Are their family members quarantining themselves? How many days does it take for them to notify people with whom they have been in close contact? Are they even notifying others?"

Go deeper

Trump: Coronavirus is "under control"

President Trump said in an interview with “Axios on HBO” that he thinks the coronavirus is as well-controlled in the U.S. as it can be, despite dramatic surges in new infections over the course of the summer and more than 150,000 American deaths.

  • “They are dying, that's true. And you have — it is what it is. But that doesn't mean we aren't doing everything we can. It's under control as much as you can control it. This is a horrible plague,” he told Axios' Jonathan Swan.
Updated 3 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Eniola Odetunde/Axios

  1. Global: Total confirmed cases as of 12:30 p.m. ET: 18,860,908 — Total deaths: 708,676— Total recoveries — 11,394,821Map.
  2. U.S.: Total confirmed cases as of 12:30 p.m. ET: 4,834,546 — Total deaths: 158,445 — Total recoveries: 1,577,851 — Total tests: 58,920,975Map.
  3. Politics: Pelosi rips GOP: "Perhaps you mistook them for somebody who gives a damn" — Ohio Gov. Mike DeWine tests positive.
  4. Public health: Fauci says task force will examine aerosolized spread.
  5. Business: July's jobs report could be an inflection point for the recovery — Teladoc and Livongo merge into virtual care giant.
  6. Sports: Where college football's biggest conferences stand on playing.

Ohio Gov. Mike DeWine tests positive for coronavirus ahead of Trump visit

Photo: Justin Merriman/Getty Images

Ohio Gov. Mike DeWine has tested positive for COVID-19 and plans to quarantine at his home for the next 14 days, his office announced Thursday. He currently has no symptoms.

Why it matters: The 73-year-old DeWine was set to meet President Trump Thursday on the tarmac at an airport in Cleveland and was tested as part of standard protocol. He is the second governor known to have contracted the coronavirus, after Oklahoma Gov. Kevin Stitt (R).

This story is developing. Please check back for updates.