A Wisconsin congressional candidate has been arrested on hate crime charges after he went on a vulgar caught-on-camera rant against an Israeli dad with his young son in the car - after he was triggered by an anti-Hamas bumper sticker.

Matthew Arndt, 54, allegedly cut off the 41-year-old father on a road in the Milwaukee suburb of Mequon Thursday morning, flipping him the bird and cursing at him before pulling into a gas station, where the dad followed him and began filming the explosive encounter.

 Do you want to tell me something?  the father asked.

4 Wisconsin congressional candidate Matthew Arndt, 54, was arrested and charged with hate crimes after being caught-on-camera in a vulgar rant towards an Israeli dad and his son. Matthew Arndt / Facebook

 Yeah, you're a f-king piece of s-t! You're a f-king traitor!  Arndt erupted, pointing an accusatory finger at the stunned motorist.

 Why do you say this?  the dad asked.

 You're a f-king Israel f-king traitor! F-k you! F-k Israel! Go f-k yourself!  Arndt raged.

By Thursday evening, Arndt had been arrested on a disorderly conduct charge with a hate crime enhancer, police said.

During the confrontation, Arndt dared the father to share the footage.

 You know what? Go post it on social media. I'm running for Congress in the 6th District, and f-k Israel! Go f-k yourself!  he shouted.

 Really? You're running for Congress?  the incredulous dad asked.

 F-k the Israel lobby! F-k the neocons!  Arndt fired back.

4 Arndt confronted the 41-year-old man after he allegedly cut him off on a roadway in Mequon, Milwaukee on Thursday morning. Obtained by NY Post

Asked his name, the candidate declared,  Free Palestine! Matthew Arndt. 

 You're a great guy. I'm definitely going to vote for you,  the father shot back sarcastically.

The Israeli immigrant, who has lived in the US for about 12 years, told The Post the bizarre confrontation began while he was driving his young son to school.

 I was driving my son to school this morning. Someone was driving behind me. I have an Israeli flag sticker with  F-k Hamas,' which, as far as I understand, is a t
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