A US Army private sought to join radical paramilitary groups, distributed instructions on how to build bombs and discussed targeting CNN, the feds charged Monday.

He also talked about targeting Democratic presidential hopeful Beto O’Rourke, according to a complaint filed in Kansas federal court.

Jarrett William Smith, 24, told the FBI after his arrest that he wanted to cause “chaos,” the complaint says.

The FBI began monitoring Smith in March, after a series of Facebook chatroom exchanges on bombmaking and fighting overseas with radical groups caught the agency’s attention, according to the complaint.

Smith, who had been stationed at Fort Riley, Kan., chatted about joining paramilitary armies in the Ukraine, and at one point connected with an alleged former member of one of the groups, the FBI claims.

“No former military experience, but if I cannot find a slot in Ukraine by October, I’ll be going into the Army,” Smith allegedly told the man, identified as Carl Lang, in a 2016 exchange.

“To fight is what I want to do,” Smith wrote. “I’m willing to listen, learn and train. But to work on firearms is fine by me too.”

Smith enlisted in 2017 and transferred to Fort Riley earlier this year.

In August, an FBI informant — and later an undercover agent — befriended Smith online and began engaging in exchanges about bombmaking and potential targets.

“Making AK-47s out of expensive parts is cool,” Smith allegedly wrote to the undercover agent last Friday, the day before his arrest.

“But imagine if you will if you were going to Walmart instead of [a] gun store to buy weapons.”

Smith gave explicit instructions online for building car bombs, cellphone-activated explosive devices and even a “quick and cheap gas grenade,” the federal complaint says.

“Oh yeah, I got knowledge of IEDs [improvised explosive devices] for days,” he allegedly bragged in December. “We can make cellphone IEDs in the style of the Afghans. I can teach you that.”

Last month, Smith named “the headquarters of a major American news network” as a target “utilizing a vehicle bomb,” the feds allege.

CNN reported Monday that it was the network in question.

He also talked about killing members of the radical-left Antifa movement and destroying nearby cellular towers, the FBI says.

Smith is charged with one count of distributing information related to explosives and weapons of mass destruction.

He was ordered held without bail and faces up to 20 years in prison.