President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Sunday hit back at criticism over the FBI's investigation into sexual misconduct allegations against Supreme Court nominee Brett Kavanaugh, saying the investigation will "never be enough" for Democrats.

"Just starting to hear the Democrats, who are only thinking Obstruct and Delay, are starting to put out the word that the 'time' and 'scope' of FBI looking into Judge Kavanaugh and witnesses is not enough," Trump wrote on Twitter.

"Hello! For them, it will never be enough - stay tuned and watch!" he added.

Wow! Just starting to hear the Democrats, who are only thinking Obstruct and Delay, are starting to put out the word that the “time” and “scope” of FBI looking into Judge Kavanaugh and witnesses is not enough. Hello! For them, it will never be enough - stay tuned and watch! — Donald J. Trump (@realDonaldTrump) September 30, 2018

Trump's comments come hours after Democrats on Sunday talk shows questioned whether the White House had its hand in controlling the FBI investigation into allegations against Kavanaugh, a suggestion based on an NBC News report that the White House has refuted.

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NBC News reported that the White House counsel’s office provided the FBI with a list of witnesses they are permitted to interview about two of the three claims made against Kavanaugh.

NBC reported that while the FBI was given the OK to review sexual misconduct allegations against Kavanaugh from Christine Blasey Ford and Deborah Ramirez, it was not permitted to look into claims from Julie Swetnick.

Swetnick, who is represented by Michael Avenatti, alleged in a signed declaration last week that Kavanaugh was among a group of young men in the 1980s who routinely sought to intoxicate women so they could be “gang raped."

Kavanaugh has dismissed Swetnick’s allegations as a “farce,” and Trump has attacked Avenatti as a “lowlife.”

Trump, who has claimed the allegations against Kavanaugh are part of a Democratic "con job," insisted on Saturday that he wants the FBI "to interview whoever they deem appropriate, at their discretion."

The president approved of the bureau reopening its background investigation into Kavanaugh after senators, led by Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.), pushed for the review. A Senate vote on Kavanaugh's confirmation was delayed one week pending the investigation.

Sens. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) and Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (D-Hawaii), who both serve on the Judiciary Committee, expressed concerns on Sunday that the White House was attempting to "micromanage" the FBI's assessment of claims against Kavanaugh.

Klobuchar acknowledged that her knowledge of whether the White House has limited the FBI investigation was based on media reports.

Hirono insisted that the FBI be given enough time to "get to the bottom" of the allegations.

"Even if it’s seven days, that’s bad enough. But then to limit the FBI as to the scope and who they’re going to question … that’s not the kind of investigation that all of us are expecting the FBI to conduct," Hirono said on ABC's "This Week."

Press secretary Sarah Huckabee Sanders and White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE refuted in separate appearances any suggestion that the White House was involved in the FBI investigation.

"The White House isn't intervening. We're not micromanaging this process," Sanders said on "Fox News Sunday."

"This is something — it's a Senate process," she continued. "It has been from the beginning. And we're letting the Senate continue to dictate what the terms look like."