Rep. Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.) said Sunday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's refusal to rule out a pardon for his former campaign chairman, Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, adds to evidence that the president is obstructing justice.

"The president continues to dangle a pardon for Paul Manafort, which only adds to growing body of evidence that the president is engaged in obstructing justice," Schiff, the incoming chairman of the House Intelligence Committee, said on ABC's "This Week."

Rep. Adam Schiff on charge that Paul Manafort lied in testimony to the special counsel: "The president continues to dangle a pardon for Paul Manafort, which only adds to the growing body of evidence that the president is engaged in obstructing justice." https://t.co/04Cn5K0bxP pic.twitter.com/Ho5UGFhTCu — This Week (@ThisWeekABC) December 2, 2018

Trump said last week that he had not discussed a pardon for Manafort, but that he would not "take it off the table."

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Manafort pleaded guilty in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation after he was convicted on bank and tax fraud charges in order to avoid a second, separate trial. However, prosecutors last week accused Manafort of violating his plea agreement by lying to investigators.

Schiff, who is among the most outspoken critics of the president, said Sunday that Mueller will have to "throw the book" at Manafort and Jerome Corsi, a Stone associate who publicly declared last week that he would reject a plea deal from the special counsel and instead file a criminal complaint in the case. Corsi has come under scrutiny for his ties to WikiLeaks founder Julian Assange.

"You cannot have people who are essentially in discussions with you flaunt that process, deceive you, if you want to telegraph to other witnesses that you darn well better be true when you say you want to cooperate with us," Schiff said.

Mueller has thus far obtained guilty pleas from former Trump associates Michael Flynn, Michael Cohen and George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE for lying to investigators or Congress.