The ranking Democrat on the House Intelligence Committee says that he is worried Republicans are planning to dissolve the committee's Russia probe at the end of the year, blasting Republicans for failing to issue subpoenas or schedule witness interviews in the new year.

Rep. Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer MORE (D-Calif.) tweeted Friday that he believes Republicans in House leadership are planning to shut down the investigation after holding just enough interviews to give the illusion of a full investigation.

"I’m increasingly worried Republicans will shut down the House Intelligence Committee investigation at the end of the month," Schiff tweeted. "Republicans have scheduled no witnesses after next Friday and none in 2017 [sic]. We have dozens of outstanding witnesses on key aspects of our investigation that they refuse to contact and many document requests they continue to sit on."

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The New York Times reported Friday that the committee is scheduling its final witnesses of the year to testify in New York, despite important votes coming up in Washington, D.C., and confirmed no additional witnesses are scheduled yet in 2018.

"It appears Republicans want to conduct just enough interviews to give the impression of a serious investigation," Schiff charged.

Rep. Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (S.C.), a senior Republican on the committee, denied to the Times that the investigation is definitively over, saying it would wrap up naturally.

“I feel no need to apologize for concluding an investigation,” Gowdy told the Times.

I’m increasingly worried Republicans will shut down the House Intelligence Committee investigation at the end of the month.



Here’s why: — Adam Schiff (@RepAdamSchiff) December 15, 2017

It appears Republicans want to conduct just enough interviews to give the impression of a serious investigation. — Adam Schiff (@RepAdamSchiff) December 15, 2017

In subsequent tweets, Schiff warned that attacks on the integrity of Robert Mueller's special counsel office are a warning sign that could mean Republicans in Congress and the White House are planning on targeting that investigation as well.

The House Intelligence Committee, as well as Mueller, are conducting separate probes into Russian election interference and possible collusion between Moscow and the Trump campaign.

"Beyond our investigation, here’s what has me really concerned: The attacks on Mueller, [Justice Department] and FBI this week make it clear they plan to go after Mueller’s investigation," he tweeted. "Aggressively and soon."

"By shutting down the congressional investigations when they continue to discover new and important evidence, the White House can exert tremendous pressure to end or curtail Mueller’s investigation or cast doubt on it," Schiff concluded. "We cannot let that happen."

Schiff also blasted Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.), saying the responsibility to ensure the House conducts a thorough investigation ultimately falls on him.

The responsibility to conduct a thorough investigation, or to prevent one, ultimately falls on @SpeakerRyan. I’m concerned he's heeding the calls of Bannon and @POTUS to “DO SOMETHING” by closing down the Russia investigation & opening up another investigation of Hilary Clinton. — Adam Schiff (@RepAdamSchiff) December 15, 2017

Speculation has swirled for weeks over whether 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 would fire Mueller as the special counsel investigation ensnares several former members of the Trump campaign.

In November, former national security adviser Michael Flynn pleaded guilty to lying to the FBI about his contacts with Russia. The month before, former Trump campaign chairman Paul Manafort and a business associate were charged with money laundering and fraud under Mueller's probe.

Leadership on the House Intelligence Committee did not immediately respond to a request for comment.