The House has not voted on a formal impeachment inquiry, but House Judiciary Chairman Jerry Nadler says his committee's investigation constitutes "formal impeachment proceedings" and the committee has a goal of deciding whether to recommend articles of impeachment by the end of the year.
"It is clear that any other American would have been prosecuted based on the evidence Special Counsel Mueller uncovered in his report," Nadler said in a statement. "Corey Lewandowski and Rick Dearborn were prominently featured in the Special Counsel's description of President Trump's efforts to obstruct justice by directing then-White House Counsel Don McGahn to fire the Special Counsel, and then by ordering him to lie about it."
Peter Chavkin, Lewandowski's attorney, questioned why Lewandowski was receiving a subpoena from the committee.
"Mr. Lewandowski has voluntarily appeared before and cooperated with Congress three times answering questions for hours. He also has spoken for hours with the Special Counsel's office. In light of this, it is fair to ask what could be gained from requiring him to appear yet again," Chavkin said, declining further comment.
A Republican Judiciary Committee aide also criticized the subpoena, accusing Democrats of wasting "more time and taxpayer dollars as Democrats demand information we already have."
So far, the committee's subpoenas have not yielded much of value beyond dozens of objections to questions about anything that happened in the Trump administration and a pair of lawsuits to try to obtain former special counsel Robert Mueller's grand jury information and testimony from former White House counsel Don McGahn.
The subpoena to Lewandowski comes as he is considering a Senate bid in New Hampshire. He's attending the President's rally Thursday night in the state, and White House aides say to expect Trump to bring up Lewandowski's potential Senate run.
The committee last week filed a lawsuit to force McGahn to comply with its subpoena after he did not appear under subpoena for a hearing in May. The outcome of that case is likely to determine whether other former Trump officials can refuse to answer questions about the Trump White House. But it's likely to take months, if not longer, before the case is decided.
The Judiciary Committee has pointed to two episodes involving Lewandowski from the Mueller report as clear cases of obstruction of justice.
The first was when Trump told Lewandowski to ask Sessions to limit the Mueller investigation not to investigate the Trump campaign but to "move forward with investigating election meddling for future elections." Lewandowski tried to set up an in person meeting with Sessions, but did not do so, according to the special counsel.
That led to the second episode the committee cited, which also involved Dearborn. A month after making the request to Lewandowski about Sessions, the President followed up with Lewandowski and told him that if Sessions did not meet with him, he would be fired.
Lewandowski did not deliver the intended message to Sessions. Instead, he asked Dearborn to speak to Sessions, believing he would be a better messenger, the special counsel wrote.
Lewandowski gave Dearborn a typewritten version of the President's message, which "definitely raised an eyebrow" for Dearborn and made him uncomfortable, according to Mueller's team. Dearborn told Mueller he did not recall if he knew the message was from the President. Dearborn later told Lewandowski he had handled the situation but he did not follow through.
This story has been updated with additional developments Thursday.
CNN's Kara Scannell, Jeremy Diamond and Kaitlan Collins contributed to this report.