Donald Trump Jr. joked that there is a “flash flood warning” Monday night because "liberal tears will be flowing” when President Trump unveils his nominee to the the Supreme Court.

“*Flash Flood Warning Tonight at 9PM EST*,” Trump Jr. tweeted Monday evening.

“This is not a joke. Liberal tears will be flowing like Niagara Falls when #POTUS announces his second #SCOTUS pick,” he added. “Please take all necessary precautions & bring an inner tube or boogie board to ride this blue wave.”

[Update: Trump nominates Brett Kavanaugh to Supreme Court]



*Flash Flood Warning Tonight at 9PM EST*



This is not a joke. Liberal tears will be flowing like Niagara Falls when #POTUS announces his second #SCOTUS pick.



Please take all necessary precautions & bring an inner tube or boogie board to ride this blue wave. 😂🇺🇸😂🇺🇸😂#maga — Donald Trump Jr. (@DonaldJTrumpJr) July 9, 2018

The tweet comes just before President Trump is slated to reveal who he will nominate to the Supreme Court to succeed Justice Anthony Kennedy at 9 p.m. Kennedy announced last month that he would be retiring, effective on July 31.

Potential candidates for the nomination include appeals court judges Amy Coney Barrett, Brett Kavanaugh, Thomas Hardiman, and Raymond Kethledge.

President Trump's choice to replace Kennedy, if confirmed, will be the second Supreme Court Justice he nominates. Justice Neil Gorsuch was President Trump’s first Supreme Court nominee, following Justice Antonin Scalia’s death.

[More: Twitter erupts after Trump nominates Brett Kavanaugh to Supreme Court]