"If they [Republicans] break as a group, the president is totally on an island, totally unprotected from [Special Counsel Robert] Mueller, totally unprotected from a lot of things," Chuck Todd said.
"It just like a lot of other things we've done in Washington," the Republican senator from Kentucky argued. "We've overcriminalized campaign finance."
NBC News host Megyn Kelly had a history of dubious comments about race.
Amid backlash for her "blackface" comments, it is rumored that Kelly's job as host of her "Today" show segment is at risk.
CNN anchor speaks out after President Donald Trump has threatened to revoke NBC News's broadcast license.
The president accused the network of making up a story about his alleged request for more nuclear weapons.
NBC's Lester Holt, the moderator, chose three topics for the first debate: America's direction, achieving prosperity and securing the U.S.
The announcement came amid speculation that the former Maryland governor might not secure a spot on stage.
Tuesday marks the former anchor's return to TV since he was suspended in February.
After last week's primary debate, poll shows 23 percent of Republican voters support Donald Trump.
How much do you need to trust the man reading a teleprompter?