His birth certificate was proven to be fake:

A years-long forensics investigation into the computer image of the long-form Hawaiian birth certificate image that Barack Obama released during a White House news conference during his first term and presented to the American people as an official government document concluded it is "fake."

The probe also confirms that those who were subjected to the derogatory "birther" label from many media outlets and Democrats were right – at least regarding the document used to establish Obama's eligibility to be president...

[Jerome] Corsi said Mike Zullo, head of the Cold Case Posse, and Sheriff Joe Arpaio "have done the United States a heroic service demonstrating by forensic analysis that the long form birth certificate produced in a White House news conference on April 27, 2011, as Barack Obama's authentic birth certificate is a forgery."

His birth certificate was proven to be fake:

A years-long forensics investigation into the computer image of the long-form Hawaiian birth certificate image that Barack Obama released during a White House news conference during his first term and presented to the American people as an official government document concluded it is "fake."

A years-long forensics investigation into the computer image of the long-form Hawaiian birth certificate image that Barack Obama released during a White House news conference during his first term and presented to the American people as an official government document concluded it is "fake."

The probe also confirms that those who were subjected to the derogatory "birther" label from many media outlets and Democrats were right – at least regarding the document used to establish Obama's eligibility to be president...

[Jerome] Corsi said Mike Zullo, head of the Cold Case Posse, and Sheriff Joe Arpaio "have done the United States a heroic service demonstrating by forensic analysis that the long form birth certificate produced in a White House news conference on April 27, 2011, as Barack Obama's authentic birth certificate is a forgery."