For months, Speaker Nancy Pelosi has been holding back the dam on impeaching Donald Trump, ostensibly to protect Democrats in vulnerable seats in districts critical to maintaining the majority in the House in 2020. But on Tuesday, in the hours leading up to a 4 p.m. Democratic caucus meeting, there were growing signs that the dam would break—and that Pelosi might even join the impeachment cause herself.

The revelation that the president had pressed the Ukrainian president, Volodymyr Zelensky, to investigate Hunter Biden, the son of one his strongest prospective 2020 opponents—a charge that he hardly tried to deny—amid the withholding of more than $391 million in aid, which was personally ordered by the president, changed the calculus in a matter of hours. “I believe that the Speaker will set forth her theory of how we need to proceed in this time of emergency. I know she is truly alarmed at recent revelations about the president’s conduct,” said Congressman Jamie Raskin, who sits on the House Judiciary Committee and the House Committee on Oversight and Reform. “We need to map a clear pathway forward, but we have overwhelming consensus within the caucus that it is time for us to act decisively against the president’s misconduct.” One congressional aide added, “I wouldn’t be surprised if something happens by the end of the week, where there is going to be a plan or a formal type of recognition of the process.”

What exactly Pelosi might be willing to endorse, in terms of investigating Trump, was still unclear ahead of the meeting on Tuesday. But there is a possibility that the House Speaker might appoint a “select committee” on impeachment, on which Congressman Adam Schiff—a Pelosi ally who, as chairman of the House Intelligence Committee, has played a key role in trying to obtain the details of the whistleblower complaint—would hold a prominent position. According to a senior Democratic congressional source familiar with the situation, who has been in touch with the California congressman’s team, Schiff’s team viewed such an arrangement as increasingly likely. (Schiff’s office declined to comment.)

Chatter about a select committee, comprised of lawmakers handpicked by Speaker Pelosi, has swirled on Capitol Hill since midsummer. But after Robert Mueller’s back-to-back hearings on Capitol Hill failed to spark an impeachment reckoning, talk of such a move faded. Following the revelations surrounding the whistleblower complaint over the past week, however, there has been an uptick in discussion of a select committee on impeachment, particularly given the committees the complaint has already ensnared. (Pelosi’s office did not immediately respond to a request for comment.)

Along with Schiff, Elijah Cummings and Eliot Engel, the chairmen of the House Oversight and Foreign Affairs committees, have sought information from the Trump administration on the issue. “If the recent reports are accurate, it means the President raised with a foreign leader pursuing investigations related to a political opponent in an upcoming U.S. election,” the three chairmen wrote in a letter to the White House Tuesday. “That is the very definition of corrupt abuse of power. The corruption exists whether or not the President mentioned or threatened—explicitly or implicitly—that a lack of cooperation could result in the President withholding U.S. security assistance or other forms of assistance.”

But then you have the Judiciary Committee, which is currently engaged in an “impeachment investigation” into Trump. And any move by Pelosi to form a select committee is all but assured to ruffle some feathers on the committee, arguably those of its chairman, Jerry Nadler, more than anyone. “The Judiciary Committee is the committee of jurisdiction when it comes to constitutional issues, and, specifically, of investigating obstruction of justice. They have been right there, trying to inform the public and educate the public and bring along the caucus since the beginning,” the first congressional source, whose boss sits on the Judiciary Committee, told me Tuesday. “With that said, I think that with a select committee, while there is talk of it, will actually slow down this process…And that is not what the country needs. The country needs this to be handled swiftly and thoroughly, and you have a committee that is already ready to go.”

While the situation remains fluid, the status quo seems untenable. “Part of the Speaker’s political genius is that she knows how to employ and deploy all of the best talent working together toward a common goal, and I am sure that she will figure out how to do that,” Raskin told me, though he added that he was not “privy” to conversations with the Speaker about appointing a select committee.

“Obviously a critical part of the investigation is about what took place with Ukraine, and what the impact is on national security. Adam Schiff obviously is an important voice in that investigation and analysis,” Raskin continued. “Assuming that articles of impeachment were to be voted out of the Judiciary Committee, they would go to the floor of the House, there would be debate on the floor, and there would be a group of impeachment managers who would be sent over to the U.S. Senate to bring the case and to try to persuade the Senate to see things our way. So there will be lots of opportunities for us to broaden the leadership of the investigation.”