Colorado Gov. Jared Polis. Photo: Rick T. Wilking/Getty Images

Colorado Gov. Jared Polis (D) and Nevada Gov. Steve Sisolak (D) announced on Monday that their states will join California, Oregon and Washington in their pact to work jointly in gradually lifting coronavirus restrictions.

The big picture: There are now three groups of states taking a regional approach to reopening their economies. "COVID-19 doesn’t follow state or national boundaries, and it will take every level of government working together to get the upper hand on this virus," California Gov. Gavin Newsom said Monday.

  • Western group: California, Oregon, Washington, Colorado and Nevada
  • Northeastern group: New York, New Jersey, Pennsylvania, Connecticut, Rhode Island, Delaware and Massachusetts
  • Midwestern group: Michigan, Ohio, Wisconsin, Minnesota, Illinois, Indiana and Kentucky

Go deeper

Updated 1 hour ago - Health

U.S. coronavirus updates

Data: The COVID Tracking Project; Note: Does not include probable deaths from New York City; Map: Andrew Witherspoon/Axios

The number of COVID-19 cases recorded in the U.S. was nearing 5 million on Sunday morning, Johns Hopkins data shows.

The big picture: Presumptive Democratic presidential nominee Joe Biden noted in an emailed statement that 5 million "is more than the entire population of Alabama — or of more than half the states in our union, for that matter," as he blamed president Trump for his handling of the pandemic.

First bipartisan multistate coronavirus testing drive to tackle shortages

A Whittier Street Health Center nurse performs a COVID-19 test in Roxbury, Massachusetts, on Monday. Photo: Matt Stone/MediaNews Group/Boston Herald

A bipartisan group of governors has joined the Rockefeller Foundation to deliver 3 million rapid coronavirus antigen tests to slow the spread of COVID-19 and help states safely reopen, the nonprofit announced Tuesday.

Why it matters: With no national plan, the initiative with Maryland Gov. Larry Hogan (R), Louisiana Gov. John Bel Edwards (D), Massachusetts Gov. Charlie Baker (R), Michigan Gov. Gretchen Whitmer (D), Ohio Gov. Mike DeWine (R), and Virginia Gov. Ralph Northam (D) would be the first coordinated testing strategy in the U.S.

Nevada governor signs mail-in voting bill after Trump threatens lawsuit

Nevada Gov. Steve Sisolak at a February event in Las Vegas. Photo: Alex Wong/Getty Images

Nevada Gov. Steve Sisolak (D) announced Monday evening that he's signed a bill enabling all registered voters in the state to vote by mail in November's elections.

Why it matters: President Trump told reporters Monday he'd sue Nevada in a bid to stop the mail-in measure. After Sisolak's announcement, Trump retweeted his earlier tweet stating: "In an illegal late night coup, Nevada's clubhouse Governor made it impossible for Republicans to win the state. Post Office could never handle the Traffic of Mail-In Votes without preparation. Using Covid to steal the state. See you in Court!"

Go deeper: Trump stokes fears of election-night mail voting fraud