Michigan Gov. Gretchen Whitmer has talked with Illinois Gov. J.B. Pritzker about forging a joint strategy for reopening the Great Lakes regional economy when the threat of the coronavirus subsides, Crain's has learned.

Pritzker has been talking with his peers in the Upper Midwest about a coordinated approach to lifting shelter-in-place orders ahead of President Donald Trump making a national move that may not reflect regional priorities, Crain's Chicago Business reported Tuesday.

The Illinois governor and his chief of staff have talked with Whitmer and her chief of staff JoAnne Huls about a coordinated regional approach to reopening the economies they shut down in mid-March to mitigate spread of the coronavirus, two sources with knowledge of the discussions confirmed for Crain's Detroit Business.

"Governors that I've spoken with have been frankly very positive about this idea," Pritzker said Tuesday at his daily COVID-19 briefing, according to Chicago radio station WBBM. "They've all been thinking about it individually for their states and understand that speaking with a common voice might be a positive move."

Pritzker and his office did not name the governors he's been speaking with.

"The governor is interested in exploring something like what's happening on the East and West coasts for the Midwest," Pritzker spokeswoman Jordan Abudayyeh told Crain's Chicago. "I think our goal is to work together on things such as what do you do about stay-at-home orders, legalities and so forth."

West Coast and Northeast states have jointly been working on plans for reopening their regional economies in a coordinated manner.

Senate Minority Leader Jim Ananich, D-Flint, said Tuesday he has suggested to Whitmer that Michigan work in unison with border states such as Ohio, Indiana and Illinois.

"I think a lot of those conversations are happening," Ananich said during a telephone town hall meeting for Genesee County residents. "They're looking at best practices and how our states are very similar in some ways, how they're very different, what plans are in the works."

Whitmer has extended her stay-at-home order for nonessential workers, activities and travel through April 30.

With confirmed coronavirus cases leveling off in Michigan and some other states, Trump has displayed an eagerness to reopen the national economy that was largely halted by the actions of governors like Whitmer, Pritzker and Ohio Gov. Mike DeWine.

But the federal government's top infectious disease expert, Anthony Fauci, cautioned Tuesday that the U.S. does not yet have the critical testing and tracing procedures needed to begin reopening the nation's economy weeks after the fast-spreading coronavirus essentially halted it, adding a dose of caution to increasingly optimistic projections from the White House.

"We have to have something in place that is efficient and that we can rely on, and we're not there yet," Fauci told the Associated Press.

Throughout the coronavirus crisis, Whitmer has repeatedly said she's in regular contact with Pritzker, DeWine, Indiana Gov. Eric Holcomb and Wisconsin Gov. Tony Evers, trading notes with the neighboring state governors on how to respond to various aspects of the public health threat.

At Holcomb's press briefing Tuesday, the Indiana governor said he's talked with DeWine and Kentucky Gov. Steve Beshear about a regional strategy, according to a transcript from Holcomb's office.

"We have talked, Governor Beshear, Governor DeWine and I have talked about when we get to that day, from a regional perspective, of reopening or re-entering, what those certain steps may be," Holcomb said. "We're not there yet. But we've talked about what that day may look like, and there'll be a number of, kind of, a stair step approach to if this, then this, if this, then this, but it will be driven by the data, not just our hope."

The Associated Press and freelance journalist Andrew Roth contributed to this report.