Louisiana Gov. Bobby Jindal (R) tore into Donald Trump in a speech at the National Press Club in Washington, calling the billionaire an egomaniac and a narcissist.

Jindal, who is polling near the bottom of the GOP field, just released a campaign ad in which he mocked Trump with clips of Charlie Sheen. 

He said he likes the idea of candidates going after the "political class," but that Trump is not the solution to any of the problems. 

"It's been a lot of fun, but here's the problem: Donald Trump is not a serious candidate. He's a narcissist. He's an egomaniac. The only thing he believes in is himself. I want to say what everybody is thinking about Donald Trump, but is afraid to say," said Jindal. 

"Like all narcissists, Donald Trump is insecure and weak. ... We know that only a very weak and small person needs to constantly tell us how strong and powerful they are."

Jindal said that recently Trump claimed that his favorite book is the Bible, but yet he could not name a verse or passage that had an impact on him. 

"Donald Trump has never read the Bible. The reason we know he has not read the Bible is that he's not in the Bible," said Jindal, likening the Trump campaign to a "carnival act."

He said Republicans are going to blow their chance in 2016 by possibly nominating an "un-serious, unstable" candidate in Trump. 

Watch the remarks above and hear more from Jindal at 4p ET today on "Your World."