Sen. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (R-Ky.) is slow-walking 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's counterterrorism nominee, whose nomination has languished in the Senate for months.

Paul has placed a hold on Joseph Maguire's nomination to be director of the National Counterterrorism Center, two Senate sources told The Hill on Wednesday.

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Paul's hold, which has not been publicly announced, prevents the Senate from voting on Maguire's nomination unless Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) decides to dedicate days of Senate floor time to getting him around procedural hurdles.

But if the administration wants to get him confirmed by the end of the current session of Congress, after which they will likely be forced to renominate him to the position, they'll need to work quickly.

The Senate is scheduled to be in town for less than a month before leaving for the year. They will be out of town next week before returning on Nov. 26 and are expected to recess until January beginning on Dec. 14.

It's unclear when Paul placed his hold. A Senate source told The Hill that leadership was trying to get Maguire confirmed before lawmakers left town for an abbreviated August recess but couldn't get Paul to sign off.

Dozens of nominations are typically cleared by unanimous consent or voice vote before a major break, but any one individual senator can block the request under Senate rules.

Republicans have repeatedly lashed out at Democrats, accusing them of slow-walking Trump's nominees. When McConnell announced he was canceling most of the August recess, he pointed the blame at Democrats' "historic obstruction" on nominations.

"We've got this backlog of nominations, certainly we anticipate and hope to have less obstruction on those, but I've been hoping for that for quite some time and it hasn't occurred yet," he said at the time.

Maguire cleared the Senate Intelligence Committee in July. He has the backing of committee chairman 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.), who tweeted after a committee hearing on the nomination that he's "highly qualified" and will "benefit the Intel Community and the defense of our country."

Trump announced in June that he would nominate Maguire for the post. He was previously deputy director for strategic operations at the counterterrorism center. He retired from the Navy in 2010.

A spokesman for Paul didn't immediately respond to a request for comment about the hold.

Paul has opposed other intelligence community officials, including during a high-profile fight over CIA Director Gina Haspel, and his views on privacy and surveillance put him at odds with a bulk of the Senate GOP caucus.

He isn't the only Republican senator blocking an intelligence community nominee.

Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa) announced in June that he would hold up William Evanina, Trump’s pick to be the director of the national counterintelligence and security center, because the intelligence community has not responded to congressional inquiries in a timely matter.

Grassley, according to the Senate's executive calendar, still has a hold on Evanina.