MILWAUKEE -- (CBS 58) In a conference call with Wisconsin party leaders Wednesday, June 10, DNC Chairman Perez gave the convention a vote of confidence right away.

He described a scene boosting nominee Joe Biden “when we descend on Milwaukee to celebrate our party.”

But how many people will be celebrating? The convention has already been pushed from July 13 to August 17, and convention leaders have said it will be nearly impossible to push it back further.

“We don’t know the answer today because we don’t know what the public health situation on the ground will be," Perez said.

Perez says the party will come to Milwaukee in some capacity, but even two months out, they still want to see more advice from public health experts during a fluid pandemic situation.

“Because we believe it’s really important to have a safe, exciting, inspiring convention in Milwaukee, and I’m confident we can do that.”

President Donald Trump has threatened to pull the Republican convention out of Charlotte.

Perez says there have been no such conversations from democrats.

“I chose Milwaukee, and it was my decision, because I believe that Wisconsin is a great place to highlight our values," Perez said. "Milwaukee is a resilient city that represents the resilience of America.”

Party leaders did not give a deadline for when they would know more specifics of the nature and scope of the convention.