Rand is ready to rumble.

A super PAC supporting Sen. Rand Paul (R-Ky.) has taken out the first Republican-on-Republican ad of the 2016 election cycle, a WWE-inspired spot where he promises a "Brawl for Liberty" under the Capitol dome Sunday over the Patriot Act, which he has vowed to end.

The Kentucky senator and his allies spent 11 hours speaking on the Senate floor last week and played a role in the Senate's decision to adjourn without voting on the issue; the body will reconvene Sunday to take it up.

"Get ready, America, for the biggest brawl for liberty of the century!" a WWE-style announcer screams as a cartoon of a screeching bald eagle flies across the screen.

"Defender of freedom, Senator Rand Paul!" the announcer yells. The ad was funded by America's Liberty PAC.

The video cuts to Paul's head superimposed on the torso of a jacked, shirtless man standing in front of an American flag. A cloud of flames explodes in back of him.

He's taking on President Obama or, his wrestling name, "Obama the email reader." He is aided by his "so-called conservative" sidekicks -- and here comes the Republican-on-Republican violence.

Meet "The Capitulating Canadian," Sen. Ted Cruz (R-Tex.), who is battling Paul in real life for the 2016 nomination. Cruz is pictured wearing shorts and boxing gloves and standing in front of the Canadian flag, flanked by a moose and Obama.

Paul's other competitor is Sen. Lindsey Graham (R-S.C.), who has repeatedly clashed with Paul and rolled his eyes while Paul was talking on the Senate floor. Graham is "trying to read your emails while doing donuts in a 1997 Geo Metro." The pink car ends up in flames.

"Watch them battle it out under the dome on the floor of the United States Senate," the ad says.

The ad is part of a multi-platform digital campaign that will include Facebook, Twitter and search advertising. It comes as Paul's camp issues a deluge of tweets, fundraising e-mails ads pledging to continue to fight the Patriot Act. In the wake of his Senate floor marathon, critics -- including Obama, New Jersey Gov. Chris Christie (R) and Louisiana Gov. Bobby Jindal (R) -- have piled on Paul, who seems to relish in swinging back.

"Rand Paul continues to set himself apart as the only candidate and true conservative who consistently stands for the entire Bill of Rights. So-called conservative candidates who support President Obama's massive, big government NSA surveillance plan need to come to their senses, uphold the Constitution and Stand with Rand," John Tate, founder of the PAC, said.