The Senate Intelligence Committee's investigation into Russia's 2016 election interference will extend into 2019, the panel's chairman says.

Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) told Bloomberg News in an interview published Friday that the committee expects to continue interviewing witnesses next year behind closed doors.

ADVERTISEMENT

When asked how long the committee will take to issue a report once interviews are concluded, Burr said that as many as “six months" could elapse while warning that future testimony by committee witnesses will likely be private.

The Senate committee's top Democrat, Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (Va.), concurred with Burr in telling Bloomberg that the probe would likely not wrap up anytime soon, though he has been pushing for more public proceedings.

"I don’t see the need for public hearings," Burr said. "I don’t see that happening."

President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has long signaled impatience with the investigations into Russia's election meddling and pushed for them to be wrapped up as soon as possible.

Sen. Angus King Angus KingGovernment watchdog recommends creation of White House cyber director position Democrats step up hardball tactics as Supreme Court fight heats up Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (I-Maine), a member of the Intelligence panel, said last month that he hoped the probe would conclude by the end of 2018, though such a prospect now appears unlikely.

“I’m hoping we can finish by the end of the year,” said King, who caucuses with Democrats. “We’ve pretty much completed the work on the social media part, and then after that is the hard part — the collusion issue. And we’re working on it. We’re interviewing witnesses, so we’re at it.”

Questions over whether members of the Trump campaign colluded with Russia knowingly during the 2016 election are likely to divide the panel, which has so far remained largely collegiate and bipartisan, compared to the partisan rancor that divided members of the committee's House counterpart.

Several Democratic senators, including Oregon Sen. Ron Wyden Ronald (Ron) Lee WydenDemocrats call for declassifying election threats after briefing by Trump officials Read Democrats' report countering Republicans' Biden investigation Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE, have claimed that previously known reports about Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE's meeting with a Russian lawyer connected to the Kremlin during the campaign shows “an intent to collude,” though Democrats have hesitated to say that they have seen evidence of collusion.

Trump has largely dismissed the congressional and special counsel investigations into Russia's election interference as "witch hunts" despite several former high-ranking members of his campaign falling under criminal indictment.