Rep. Stephen Lynch criticized the process behind Robert Mueller’s investigation into the Trump administration on Tuesday and expressed concerns about the release of the report. It's unclear how much of the report will be made public, and a Justice Department official said on Tuesday that Attorney General William Barr will still need weeks to finish reviewing it, the Associated Press reported.

“We're hoping [to] get the full report and are able to obtain as much evidence as possible,” Lynch said in an interview on Boston Public Radio. “I'm worried about the underlying evidence [and] whether we're going to get it all, for a couple of reasons.”

Lynch, a member of the House Committee on Oversight and Reform, the primary investigative body in the House, said he’s “deeply concerned” about provisions in the law that could prevent Congress from accessing evidence that was uncovered in a grand jury.

“I'm just concerned that they might use that as a method of denying Congress that evidence,” Lynch said.

Earlier this month, Judiciary Committee Chairman Jerry Nadler announced he had issued subpoenas and document requests to 81 people and entities as a part of the ongoing investigation.

“We have we have interrogatories to, I think, six or seven executive agencies to get information on various aspects of the Mueller investigation, [and] we're still waiting for documents,” Lynch said. “We've received zero documents in response so far.”

Lynch criticized Nadler’s “ambitious” methods, citing the need to be more measured and careful.

“I'm not sure I would have gone forward with 81 subpoenas as Jerry Nadler has done," he said. “I think probably would have picked my top 20. I think that might have been a little bit ambitious — not that you don't get them all, but coming out of the box I think it was a little bit shocking to people.”

Lynch urged his fellow Democrats to exhibit patience until every piece of evidence is uncovered, though Lynch admitted that process was fraught.

“There's a way to do this logically that I think might appear more fact-based and evidence-based, as opposed to some of my colleagues who were calling for impeachment the day after Trump got sworn in.”

Though Lynch is not directly calling for impeachment of President Donald Trump, he said he will not stand in the way of his fellow Congressional leaders who wish to draft impeachment efforts.

“There are certainly some people in that camp in Congress, and we will not dissuade them from moving forward with efforts to impeach or draft articles going forward,” he said. “There's just, there's a constituency out there that wants them to do that.”