Thursday’s release of Robert Mueller‘s Trump-Russia report moved the spotlight from the special prosecutor to Capitol Hill, where lawmakers are now forced to reckon with Mueller’s tepid yet potentially damning portrait of Donald Trump and his 2016 campaign. In his much-hyped report, Mueller declined to either fully implicate or exonerate the president on obstruction of justice, citing the current Department of Justice policy that bars sitting presidents from being prosecuted. Instead, Mueller put the ball in Congress’ court, saying the branch of government “has authority to prohibit a President’s corrupt use of his authority in order to protect the integrity of the administration of justice.” To what extent that authority will be used remains to be seen, however, as Democrats Thursday wrestled with what comes next in the long-running Trump-Russia probe.

House Democrats were clear in their determination to continue the investigation Thursday; House Judiciary chair Rep. Jerrold Nadler called for Mueller to testify before Congress just minutes after Attorney General William Barr‘s widely-derided pre-report press conference, and House Speaker Rep. Nancy Pelosi and Senate Minority Leader Chuck Schumer followed with their own joint call for Mueller to testify before both chambers. If Mueller “had found evidence exonerating the president, he would have said so,” Rep. Adam Schiff said in a press conference. “He did not. He left that issue to the Congress of the United States, and we will need to consider it.”

But the question of whether Democrats’ course of action will include impeachment proceedings has been met with skittishness among the Democratic ranks. “I don’t think we’re [at impeachment] yet. We are still in the assembling-of-facts phase,” Rep. Jamie Raskin told Politico, while Nadler acknowledged in his press conference that impeachment is “one possibility,” but said it was “too early to talk about that.” House Majority Leader Steny Hoyer was much more direct, saying in an interview with CNN, “Based on what we have seen to date, going forward on impeachment is not worthwhile at this point. Very frankly, there is an election in 18 months, and the American people will make a judgment.” Other Democrats, however, were much less cagey about taking on the “i-word”; progressive Rep. Alexandria Ocasio-Cortez officially signaled her support for impeachment Thursday, signing on to a resolution started by Rep. Rashida Tlaib and saying that Mueller’s report ”squarely puts [impeachment proceedings] on our doorstep.” The idea may even be gaining steam outside of the progressive wing of the party; Rep. Norma Torres, a member of the more moderate New Democrat Coalition, told Politico Thursday, “We need to move forward with an impeachment. This is a big deal for me.”

Despite the growing support for impeachment, though, Democrats pushing for the proceedings will likely still face some major political hurdles. Impeachment proceedings still remain largely unpopular among the electorate—only 36% of respondents supported it in a March CNN poll—and any proceedings will need Republican support in order to succeed. That seems like a tall order, as despite Mueller’s more damning claims, Republicans Thursday still remained firmly in the president’s corner. “Democrats want to keep searching for imaginary evidence that supports their claims, but it is simply not there,” House Minority Leader Rep. Kevin McCarthy said in a statement, and Rep. Doug Collins described the Mueller report as a “mountain of facts supporting the principal conclusions the attorney general and deputy attorney general shared last month: no collusion, no obstruction.” While Republicans’ firm allegiance to the president may stymie impeachment, Democrats’ determination to keep the Mueller probe alive means the report’s release isn’t “Game Over” as Republicans want. “Special Counsel Mueller’s fact-gathering has concluded,” a statement signed by six House committee chairs in response to the Mueller report said. ”It is now Congress’ responsibility to review and assess the evidence.”

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