Attorney General Bill Barr is trying to "gag" special counsel Robert Mueller before his public testimony before Congress on Wednesday, former acting Solicitor General Neal Katyal worried on MSNBC on Monday.

"When you see these new reports that the Barr Justice Department continues to try to narrow what will come out of this hearing, what does that say to you?" MSNBC anchor Ari Melber asked.

"I’m extremely concerned. I don’t think it’s narrow. I think it looks like they’re trying to gag Mueller and trying to say anything not in the report is presumptively privileged," Katyal explained.

Former federal prosecutor Nick Ackerman brought a highlighted copy of special counsel Robert Mueller's report during an appearance on MSNBC anticipating questions for Wednesday's hearing.

Host Ari Melber asked Ackerman to pick out the one page of the report that he would want to ask Mueller a question about.

Ackerman selected page 176, which relates to Roger Stone and the distribution of the stolen emails from the Democratic National Committee.

"It’s a fact, is it not, Mr. Mueller, if you look at that footnote — that your office considered charging people with the theft of stolen property and trafficking in stolen property, is that right?" Ackerman asked his hypothetical question to Mueller.

Republicans are terrified that special counsel Robert Mueller could harm President Donald Trump during public testimony before Congress, a lawyer who used to represent a Trump official explained on MSNBC on Monday.

Attorney Caroline Polisi, who represented George Papadopoulos, was interviewed on "The Beat" by Ari Melber.

The host played clips pointing out how hard it is for lawmakers to get information out of Mueller during congressional

"What's so interesting here, even in the face of all of this, they’re scared he may go rogue," Polisi explained.

"They’re still a little bit scared of that one percent possibility," she noted.