Transcript for Cooperation deal with Paul Manafort has broken down: Prosecutors
We learned overnight the plea deal with former trump campaign charm Paul manafort has fallen apart. Mueller's team claiming manafort lied several times. So, what now? Is manafort signaling he wants a pardon? Here's ABC's chief white house correspondent Jonathan Karl tonight. Reporter: With special counsel Robert Mueller expected to be nearing the end of his investigation, a major development. A cooperation deal with key witness Paul manafort has broken down. Mueller accusing the former trump campaign chairman of lying repeatedly to the FBI. Manafort has already pleaded guilty to other charges and faces the possibility of spending the rest of his life in prison. Could manafort now be hoping for a pardon from the president? Hours after the deal broke down, the president offered some of his harsh attacks yet on the special counsel, tweeting, "Wait until it comes out how horribly and viciously they are treating people, ruining lives for them refusing to lie. Mueller is a conflicted prosecutor gone rogue." Given what the president said this morning, that Robert Mueller is ruining people's lives, is he considering a pardon for Paul manafort or for others who were prosecuted and have been prosecuted? I'm not aware of any conversations for anyone's pardon involving this process. Reporter: But with a new acting attorney general who has also criticized Mueller, could the president finally pull the plug on the investigation? And if I can follow up, he also said this morning that Mueller is doing tremendous damage to the criminal justice system. If that's true, is he considering picking up the phone, calling his acting attorney general and saying fire Robert Mueller? Look, I think that the president has had Robert Mueller doing his job for the last two years and he could have taken action at any point and he hasn't. Reporter: Is he ruling it out now? So we'll let that speak for itself. He has no intent to do anything. Let's get to Jonathan Karl. There's been a lot of talk about the possibility of a government shutdown in the president doesn't get the funding for the border wall that he wants. If there is a shutdown, tonight, the special counsel is on the record about what would happen to Robert Mueller's investigation? Reporter: We saw something from the special counsel that we almost never see from them. A public statement. In this statement, the office of Robert Mueller said that their investigation will continue regardless of whether or not there is a government shutdown. Very rare public statement tonight. Jon Karl, our thanks to you.
This transcript has been automatically generated and may not be 100% accurate.