In her theory, both Donald Trump, Jr. and Republican congressional leadership may be directly implicated.
The host explained the six-month extension of the Grand Jury used to indict Roger Stone.
Maddow noted "under Justice Department rules, once a Grand Jury has indicted somebody, that Grand Jury is not allowed to keep collecting more evidence randomly about that person who they brought an indictment against. The Grand Jury serves a specific purpose."
"All Grand Juries do is indict people," she explained. "If the Grand Jury is still working on this, still taking more testimony on this after Roger Stone has already been indicted, if this is still a live case before that Grand Jury, that means they are still working on another potential indictment related to Roger Stone and Wikileaks and what Russia stole from the Democrats.
"And it could mean that it's just that Roger Stone will get indicted again -- there could be some superseding indictment coming for Roger Stone on top of the seven felony counts he's looking at," she noted. "It could be that."
"I feel like I would be remiss not to note that the one other person associated with the Trump campaign, besides Roger Stone, who admits to having months of communication with Wikileaks during the campaign ... the only other person other than Roger Stone we know of that had months of communications with Wikileaks is ... the president's eldest son and namesake, Donald Trump, Jr.," she reminded.
She played clips by Sen. Richard Blumenthal (D-CT) and Rep. Jackie Speier (D-CA) both publicly airing concerns on MSNBC that Trump, Jr. lied to their committees.
Speier sits on the House Intelligence Committee. While Republican leaders have appointed members to 23 other Congressional committees, they have not yet appointed their members to Intel, preventing the committee from meeting.
"If the special counsel, Robert Mueller, and his Grand Jury do have an interest in looking at certified transcripts of the testimony of Donald Trump, Jr. or any other witnesses before the House Intelligence Committee, the special counsel's office can only bring legal action on the basis of someone's potentially false testimony if they have an official transcript of that," she explained. "They can only get an official transcript of that testimony once the Intelligence Committee meets and votes to release that official transcript."
"If Donald Trump, Jr. or anybody else who testified to the House Intelligence is potentially in legal trouble for having lied to that committee -- the way that Roger Stone is now in legal trouble, the way Michael Cohen is in legal trouble -- House Republicans are effectively protecting those witnesses as long as they don't seat their members on that committee, so that committee cannot release its official transcript," Maddow explained.
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