Rep. Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) on Sunday did not rule out beginning impeachment proceedings against President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE.

Nadler, who is chairman of the House Judiciary Committee, told NBC's "Meet the Press" that Congress will have to receive an unredacted copy of 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 report and hear from Mueller and Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE before reaching a determination on impeachment.

“Some of this would be impeachable,” Nadler said, referring to Trump's actions laid out in Mueller's report. “Obstruction of justice, if proven, would be impeachable," he added.

WATCH: Chuck Todd asks Rep. Nadler if he thinks the Mueller Report includes grounds for impeachment?@chucktodd: “Do you think this is impeachable?”@RepJerryNadler: “Yeah, I do… obstruction of justice, if proven, would be impeachable.” pic.twitter.com/A3GRmOP8ao — Meet the Press (@MeetThePress) April 21, 2019

Mueller declined make a determination on possible obstruction of justice by Trump, concluding that the evidence did not reach a threshold to charge the president with obstruction.

The special counsel, however, wrote in his report that his team probed 10 “episodes” of potential obstruction of justice, leaving the door open to possible congressional probes of Trump’s conduct.

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Mueller's report says Trump tried on multiple occasions to thwart Mueller's probe into Russian interference in the 2016 election, including ordering then-White House counsel Don McGahn to fire Mueller in 2017.

House Democrats on Thursday and Friday seized on Mueller’s findings on obstruction, with Nadler issuing a subpoena Friday morning for the special counsel’s unredacted report.

Earlier Sunday, Rep. Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris 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 MORE (D-Calif.), the chairman of the House Intelligence Committee, said Democrats "may" bring impeachment proceedings.