Ten months after the House and Senate intelligence committees launched dual investigations into Russian interference in the 2016 election, Republican lawmakers have begun calling for them to end, with some eager to wrap up by the end of the year. But with the pivotal question of whether Donald Trump's campaign has colluded with the Russian government left unanswered, and in the face of new inquiries regarding the Trump campaign's ties to a Robert Mercer-backed data-mining company, Democrats are reluctant to close the books on the probes or tie themselves to a timeline—potentially foreshadowing a partisan showdown.

In recent weeks, both Democrats and Republicans on the Senate Intelligence Committee have expressed doubts that they will reach a clear-cut conclusion, conceding that Robert Mueller’s F.B.I. investigation is more likely to yield such results. Despite having a long list of remaining witnesses to question, Senator Richard Burr, the chairman of the committee, said he hopes to complete the inquiry by February. “If there’s evidence that there was something there, that will be laid out. If there’s no evidence, how could anybody object to it?” Burr told Politico. Other Republicans have taken their criticism of the ongoing probes a step further. “We’ve hit the point of diminishing returns long ago,” Senator Jim Risch of Idaho said. “We’ve looked at lots of stuff. At some point in time, the jury needs to reach a verdict.”

Pressure to issue said verdict is highest in the House, where the panel tasked with exploring the breadth of Kremlin influence during the election has been plagued with partisan infighting. Congressman Mike Conaway—who took over the probe after Devin Nunes was forced to step down amid accusations that he was protecting the White House—told reporters that he wants to reach a conclusion as soon as possible. “I have no interest in prolonging this one second longer than [necessary],” he said, according to The Hill, although he conceded that completing a thorough investigation “takes some time.”

But Democrats on the House committee could impede Conaway’s plan. Adam Schiff, the ranking Democrat on the panel, derided his colleague’s timeline as unrealistic and, along with other members of his party, has argued that while the congressional committee hasn’t yet surfaced conclusive evidence of collusion. “We’ve certainly seen evidence of an intention by the Trump campaign to collude with the Russians,” Schiff told Politico. “I would hope that, at the end of the day, we’ll come to a common conclusion on that as well.” Eric Swalwell, another outspoken Democrat on the House Intelligence Committee, echoed the sentiment. “We may not find the crime on videotape, but I believe we have already seen evidence of intent,” the California lawmaker said. “But our investigation is ongoing and we haven’t reached a conclusion.” (Other Democrats have tried to lower expectations on what the committees will deliver: “The probability that we’re going to produce a report that buttons down every question is pretty low,” said Jim Himes, a Democrat from Connecticut.)

Beyond timeline, there are also growing concerns that Democrats and Republicans in the House and Senate will arrive at starkly different conclusions. In an attempt to avoid this outcome, Conaway is pushing to work with Schiff, Burr, and Mark Warner, the ranking Democrat on the Senate Intelligence Committee, on a unified conclusion—an idea Schiff supports. But Warner dismissed the idea that the various committee members aren’t already in sync. “We’re still operating in a very collaborative fashion,” Warner told Politico.