The former sheriff was tricked into believing he was appearing on a Finnish YouTuber's video.
Baron Cohen, posing as the YouTuber, asked Arpaio if he would receive a blowjob from President Trump, to which the sheriff replied: "I may have to say yes."
Arpaio is the latest in a string of prominent Republicans to be deceived by Baron Cohen on his TV series.
Sacha Baron Cohen's ritual humiliation of prominent Republicans has once again borne fruit — and this time it's in the form of Arizona Sheriff Joe Arpaio.
In the latest episode of Baron Cohen's satirical sensation "Who is America?" the actor poses as a Finnish YouTuber called OMGWhizzBoyOMG (real name: Ladislas Kekkonen) who invites the self-styled "toughest sheriff in America" on his show.
In reference to the explosive Trump dossier, Baron Cohen asks Arpaio, who is a close ally of Donald Trump, whether the president might have had a golden shower, to which the sheriff replies: "Wouldn't surprise me."
Baron Cohen then asks the sheriff: "If Donald Trump calls you up after this and says, 'Sheriff Joe, I want to offer you an amazing blow job,' would you say yes?"
"I may have to say yes," Arpaio replies.
The show also features Arpaio arguing with a plastic Shopkins toy — an anti-firearms "D'lish Donut."
"Delicious donut, you have to understand that you have to follow the constitution and the law and allow people to have guns," he's seen telling the donut.
Baron Cohen tells Arpaio that unlike D'lish Donut, he is a staunch gun advocate, boasting a collection of over 43.
"Oh yes, I've been collecting them for the upcoming race war," Baron Cohen says.
He also gives "Finnish" addresses to the camera throughout the segment, which are clearly gibberish.
The former sheriff responded to being duped by Baron Cohen back in July, saying, "I was kind of mad at myself."
"I started to get a little angry, a little sad, but I went through it," he said.
Arpaio is best known for illegally detaining Latinos and keeping inmates in brutal jail conditions during his 24-year tenure as Sheriff in Maricopa County, Arizona. His aggressive tactics ultimately led to a criminal conviction after he violated a court order in a racial-profiling case. However, he was let off the hook when President Trump issued his first ever presidential pardon to Arpaio in August 2017.
The former lawman announced in January that he intended to run for US Senate — though he might find his credibility rattled once again after being embarrassed by Baron Cohen.
Arpaio is the latest in a string of prominent Republicans to be deceived by Baron Cohen as part of "Who Is America?"