At a news conference Tuesday in Phoenix that will be live-streamed by WND, Sheriff Joe Arpaio and his Cold Case Posse will present "indisputable proof" the Obama birth document released by the White House is a forgery, according to the posse's lead investigator.

Mike Zullo said the new information was developed during an investigative trip to Hawaii in May.

The press conference will be held Tuesday at 5:30 p.m. Eastern Time at the Maricopa County Sheriff's Office. [Local time will be 2:30 p.m., as Arizona does not observe Daylight Saving Time].

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The investigative team also promises to release more conclusions drawn from computer analysis of the document the White House released April 27, 2011. The White House claimed the document was "proof positive" that Obama is eligible for the presidency under Article 2, Section 1 of the U.S. Constitution.

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At the March 1 conference, as WND reported, Arpaio and his Cold Case Posse announced that probable cause exists to believe that the document purported to be Obama's original, long-form birth certificate is a forgery. The posse said it also found probable cause to believe that Obama's Selective Service registration form is fraudulent.

Join with Sheriff Arpaio in his work to uncover the truth by donating to the Cold Case Posse expenses, or contribute to a fund that supports investigations by both WND and the sheriff.

Three weeks after the March 1 press conference, Arpaio said there would be "tons" more potentially shocking information on Obama in connection with his probe into the president's eligibility.

WND reported in May that a letter from Hawaii's Department of Health verifying Obama's birth in Honolulu has "opened the door" to some "shocking revelations" the posse is promising to disclose.

Zullo said at the time he could not reveal more information but noted he and his investigators had reservations about a letter stamped with Registrar Alvin Onaka's name that was sent to Arizona Secretary of State Ken Bennett as verification of Obama's Hawaiian birth.

Zullo said the letter fails to list Obama's birth date and is merely stamped with the registrar's name, while another person's initials appear next to the signature.

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Is Obama constitutionally eligible to serve? Here's WND's complete archive of news reports on the issue.

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