And tonight we're learning the unique rules both President Biden and Donald Trump agreed to before their head-to-head showdown that will air right here on CBS.

We get more now from CBS's Robert Costa.

With their campaigns ramping up, President Biden and former President Trump are also preparing to face off next week with some differences from the raucous 2020 debates.

Radical left.

Will you shut up man?

Sources tell us when one candidate is speaking the other's microphone will be muted at the CNN hosted event.

There will be no opening statements and two minutes to answer questions.

And Trump pivoted from weekend birthday wishes on the trail to a meeting with Speaker Mike Johnson at Trump's Florida home Monday.

A summer showcasing of the former president's solidarity with Republicans.

Sources say Trump is also staying close with far-right allies like Steve Bannon.

Speaking at a conservative convention in Detroit on Saturday, Bannon echoed Trump in vowing retribution against those who investigated the former president and his political allies.

We're going to run them all out of town.

It's very simple.

Victory or death.

Despite intense support from Trump's base, weeks after his criminal conviction, Trump is locked in a tight race with President Biden, especially in key battleground states.

Biden advisors privately say putting Trump's conduct and American democracy front and center is a necessary strategy.

This election is between a convicted criminal who's only out for himself and a president who's fighting for your family.

And at a star-studded weekend fundraiser, President Biden was joined by former President Obama while weighing in on the future legal impact of the election.

The next president is likely to have two new Supreme Court nominees, two more.

Sources tell me President Biden will prep for the debate later this week at Camp David, and Trump allies tell me his prep is more informal.

They say he's also moving closer to a decision on a running mate with North Dakota Governor Doug Burgum gaining momentum, among others.

Nora.

Robert Costa, thank you very much.