Sen. Rand Paul Randal (Rand) Howard PaulThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand 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 MORE (R-Ky.) on Saturday celebrated Festivus with a series of tweets airing his grievances against various political figures.

The fake holiday, which was the focus of a “Seinfeld” episode, involves airing grievances against those who have been disappointments through the year.

"Good morning, #Festivus celebrants and twitter! Today, I will have an #AiringofGrievances to wish you a #HappyFestivus," Paul tweeted Saturday morning.

He went on to target several people, including 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.

I want to pause to wish @realDonaldTrump a Happy Festivus. We told him to take today off, since he airs his grievances on here every day pic.twitter.com/OicIz1x5Uj — Senator Rand Paul (@RandPaul) December 23, 2017

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He also had a grievance with former Sen. Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.), questioning how the Nevada Democrat never told him "about the aliens."

The grievance appeared to be a reference to a report earlier this month that the Pentagon acknowledged for the first time the existence of a program charged with investigating unidentified flying objects.

According to a New York Times report, the $22 million Advanced Aerospace Threat Identification Program began in 2007 and was funded primarily at the request of Reid, who has long had an interest in the topic.

On that same subject, I have a major #HappyFestivus #AiringofGrievances with my friend @SenatorReid — Senator Rand Paul (@RandPaul) December 23, 2017

We argued about taxes. Fought about spending. Worked on repatriation together. I helped treat your eye injury... — Senator Rand Paul (@RandPaul) December 23, 2017

HOW IS IT YOU NEVER TOLD ME ABOUT THE ALIENS, HARRY??!! — Senator Rand Paul (@RandPaul) December 23, 2017

He also aired a grievance with Sen. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (R-Utah), who joked the previous day that he and his wife were not the 80-something couple arrested for transporting marijuana as gifts for family in Nebraska.

Last but not least for this morning, I have an #AiringofGrievances for @senorrinhatch — Senator Rand Paul (@RandPaul) December 23, 2017

Somehow, an octogenarian Mormon has better pot jokes than I do. This has been bothering me for a while. #HappyFestivus — Senator Rand Paul (@RandPaul) December 23, 2017

Paul has celebrated Festivus in the past.

He issued a series of tweets airing his grievances last year to celebrate the made-up holiday.