In a radio interview broadcast Sunday, Arizona Sheriff Joe Arpaio affirmed he is "pretty well convinced" President Obama's birth certificate, as released by the White House in 2011, is a "fraudulent, fake document."

"I've been in law enforcement 55 years," stated Arpaio. "I think I know a fraudulent, fake document. I'm not a computer expert. I rely on my people. But I'm pretty well convinced it's a fake document."

The famous sheriff was being interviewed for "Aaron Klein Investigative Radio," broadcast on New York's AM 970 The Answer and Philadelphia's NewsTalk 990 AM.

Listen to "Aaron Klein Radio" clip of Joe Arpaio discussing Obama's birth certificate:

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The subject of the interview was Arpaio's reaction to the controversy surrounding statements about Mexican immigrants made by presidential candidate Donald Trump.

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During the interview, Arpaio brought up the birth certificate.

"I thought we have freedom of speech in this country," stated Arpaio when asked about the decision by Univision, NBC and Macy's to cut business ties with Trump and reports the city of New York is reviewing its contracts with the billionaire's businesses.

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"And he's running for president. He has a right to voice his opinion."

Arpaio added that Trump "did talk about the birth certificate in the past."

"You know I've been working on that. So I don't know. I guess you got to be politically correct when you run for office," he said.

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Trump and Arpaio both have claimed Obama's birth certificate may be forged. Arpaio's office has been investigating the birth certificate since 2011.

Arpaio's statements prompted Klein to ask for an update on his team's investigation into the long-form birth certificate document, posted April 27, 2011 as a PDF file on the White House website.

Arpaio told Klein that "once again nobody wants to look at it right now."

"So it's not my problem. I did my job."

Obama's qualification for president as a "natural born citizen" has been challenged in court since before he was first elected in 2008. The White House finally relented in 2011 and posted a birth certificate, but Arpaio's investigative team concluded it is a forgery.

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Arpaio's appointed lead investigator on the birth-certificate case, Mike Zullo, has been promising the release of "universe-shattering" information regarding the document.

"When this information is finally exposed to the public, it will be universe-shattering. This is beyond the pale of anything you can imagine," he told WND in a December 2013 interview.

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Zullo has testified that the White House computer image of Obama's birth certificate contains anomalies that are unexplainable unless the document had been fabricated piecemeal by human intervention, rather than being copied from a genuine paper document.

See some of Zullo's evidence:

Zullo has noted that Reed Hayes, a document examiner who has served as expert witness for Seattle law firm Perkins Coie – the firm that flew an attorney to Honolulu to personally deliver two paper copies of the birth certificate to the White House – has concluded in a signed affidavit that the document posted on the White House website is "entirely fabricated."

The White House also has never verified the authenticity of a letter purportedly sent by President Obama to the Kapi'olani Medical Center for Women and Children in Honolulu in which he declares the center to be "the place of my birth."

There also remains a mystery as to why Obama is using a possibly fraudulent Connecticut-based Social Security Number, when he and his parents never resided in the Constitution State.