WASHINGTON — Republicans and Democrats are scrambling in the final days of 2017 to establish an enduring narrative on multiple Russia investigations and the integrity of the investigators, a partisan messaging battle that has intensified as special counsel Robert Mueller has appeared to focus more intently on President Donald Trump and his inner circle.

Congressional Republicans who have put up with almost a year’s worth of speculation and investigations into Trump’s ties to Russia are hoping to move on from that topic in 2018, renewing focus on Democrat Hillary Clinton and stepping up criticism of Mueller. Democrats remain focused on Trump and are pushing to keep congressional investigations on Russia going for months to come.

On Thursday, Republicans brought the topic back to Clinton as two committees began conducting interviews in a new investigation of the FBI and its 2016 inquiry into Clinton’s email server. The House Judiciary and Oversight and Government Reform committees spent hours behind closed doors with Deputy FBI Director Andrew McCabe, who was involved in that probe. Republicans charge that there is anti-Trump bias within the ranks of the bureau.

Democrats are accusing the GOP of diversionary tactics and say their criticism could embolden Trump to take steps to fire Mueller.

“This is a fight for the soul of our democracy,” said Maryland Rep. Elijah Cummings, the top Democrat on the oversight panel, on Thursday. “Nothing less.”

Virginia Sen. Mark Warner, the top Democrat on the Senate intelligence committee, made a speech Wednesday on the Senate floor warning Trump not to take any action relating to Mueller. He said Thursday that he gave the speech because the “tone and tenor” coming from the White House and its allies “should send a chill through all of us.”

Trump and White House officials have insisted in recent weeks that the president has no intention of firing Mueller, a decision that would likely be up to Deputy Attorney General Rod Rosenstein, who appointed the special counsel.

Some Republicans charge that Democrats’ pushback is disingenuous, given Trump’s recent words.

“I think it’s a lot of posturing and I think it’s a lot of trying to scare people that the boogeyman is out there and he’s certainly going to come get us when that doesn’t seem to be the focus at all from the White House,” said Oklahoma Sen. James Lankford, a member of the Senate intelligence committee.

Like many Republicans, Lankford said he doesn’t think Mueller should be removed, though he says he has concerns about bias at the FBI since hundreds of text messages were revealed between an FBI counterintelligence agent and an FBI lawyer criticizing Trump. Both had been assigned to Mueller’s investigation.

Both the House and Senate intelligence panels have spent most of the year investigating Russian interference in the 2016 elections and whether Trump’s campaign in any way colluded with the Russians. While the mostly bipartisan Senate probe is expected to continue well into 2018, House Republicans are conducting some of their final interviews this week and are hoping to release a report next year.

Democrats charge that Republicans are rushing the conclusion of the House investigation, saying there are more witnesses to see and documents to obtain.