The father of Omar Mateen, identified by police as the man behind the carnage at an Orlando nightclub early Sunday morning, is an Afghan man who holds strong political views, including support for the Afghan Taliban.

Seddique Mateen, who has been referred to as Mir Seddique in early news reports, hosted the "Durand Jirga Show" on a channel called Payam-e-Afghan, which broadcasts from California. In it, the elder Mateen speaks in the Dari language on a variety of political subjects. Dozens of videos are posted on a channel under Seddique Mateen's name on YouTube. A phone number and post office box that are displayed on the show were traced back to the Mateen home in Florida. Mateen also owns a nonprofit organization under the name Durand Jirga, which is registered in Port St. Lucie, Fla.

In one video, Mateen expresses gratitude toward the Afghan Taliban, while denouncing the Pakistani government.

Latest footage of Orlando nightclub shooting

"Our brothers in Waziristan, our warrior brothers in [the] Taliban movement and national Afghan Taliban are rising up," he said. "Inshallah the Durand Line issue will be solved soon."

The "Durand Line issue" is a historically significant one, particularly for members of the Pashtun ethnic group, whose homeland straddles the border between Afghanistan and Pakistan. The Durand Line is that border. It is not clear whether the Mateens are Pashtun. The Afghan Taliban is mostly made up of Pashtuns.

The line was drawn as a demarcation of British and Afghan spheres of influence in 1893. The British controlled most of subcontinental Asia at the time, though some parts, including what is now Afghanistan and northwest Pakistan, were only loosely held. The line was inherited as a border by Pakistan after its independence. Since it splits the Pashtun population politically, it is seen as a cause for their marginalization. Pashtuns are the largest ethnic group in most of eastern Afghanistan and northern Pakistan.

Pashtuns are also sometimes referred to as Pakhtuns, or Pathans.

Just hours before the Orlando shooting, Seddique Mateen posted a video on a Facebook page called Provisional Government of Afghanistan -- Seddique Mateen. In it, he seems to be pretending to be Afghanistan's president, and orders the arrest of an array of Afghan political figures.

"I order national army, national police and intelligence department to immediately imprison Karzai, Ashraf Ghani, Zalmay Khalilzad, Atmar, and Sayyaf. They are against our countrymen, and against our homeland," he says, while dressed in army fatigues.

The most recent video on Mateen's YouTube channel shows him declaring his candidacy for the Afghan presidency. The timing of the video is strange, as it came a year after presidential elections were held in Afghanistan. Mateen appears incoherent at times in the video, and he jumps abruptly from topic to topic. His use of Dari, instead of Pashto, the language of Pashtuns, was another strange element of his presentation, given that he is discussing issues of Pashtun nationalism.

In pictures: Orlando nightclub shooting Show all 30 1 /30 In pictures: Orlando nightclub shooting In pictures: Orlando nightclub shooting Friends and family grieve after a list of hospitalised victims was released, implying the death of those who weren't on the list and hadn't been heard from, outside a Hampton Inn & Suites hotel near the Orlando Regional Medical Center AP In pictures: Orlando nightclub shooting People mourning for victims of the mass shooting near the Pulse gay nightclub in Orlando AFP/Getty Images In pictures: Orlando nightclub shooting Mina Justice speaks to a reporter discussing texting with her son Eddie who was in a bathroom at Club Pulse in Orlando. It has now been confirmed that Eddie Justice was among the 50 people killed in the massacre AP In pictures: Orlando nightclub shooting FBI agents investigate near the damaged rear wall of the Pulse Nightclub Getty Images In pictures: Orlando nightclub shooting Terry DeCarlo, executive director of the LGBT Center of Central Florida (C) is comforted by Orlando City Commissioner Patty Sheehan (R) after a shooting involving multiple fatalities at a nightclub in Orlando AP In pictures: Orlando nightclub shooting FBI agents investigate the damaged rear wall of the Pulse Nightclub Getty Images In pictures: Orlando nightclub shooting Police officials investigate the back of the Pulse nightclub after a shooting involving multiple fatalities at the nightclub in Orlando AP In pictures: Orlando nightclub shooting A member of the Medical Examiners office wheels a body to a vehicle from the mass shooting at Pulse Nightclub Getty Images In pictures: Orlando nightclub shooting A photograph posted by the Orlando Police Department on Twitter with the words, "Pulse shooting: In hail of gunfire in which suspect was killed, OPD officer was hit. Kevlar helmet saved his life", in reference to the operation against a gun man inside Pulse night club in Orlando REUTERS In pictures: Orlando nightclub shooting FBI, Orlando Police Department and the Orange County Sheriff's Office personnel investigate the attack at the Pulse nightclub in Orlando AP In pictures: Orlando nightclub shooting Annette Stubbs, a pastor at a local church, prays for victims a few blocks from a crime scene at the nightclub where a mass shooting took place AP In pictures: Orlando nightclub shooting Aimee McCarthy from Jacksonville, gives blood at the oneblood facility, to help the victims from a mass shooting at a nightclub in Orlando AP In pictures: Orlando nightclub shooting Police forensics investigators work at the crime scene of a mass shooting at the Pulse gay night club in Orlando REUTERS In pictures: Orlando nightclub shooting An injured person is escorted out of the Pulse nightclub after a shooting rampage AP In pictures: Orlando nightclub shooting An injured man is escorted out of the Pulse nightclub after a shooting rampage AP In pictures: Orlando nightclub shooting An injured man is escorted out of the Pulse nightclub after a shooting rampage AP In pictures: Orlando nightclub shooting Law enforcement officials work at the Pulse nightclub following a fatal shooting AP In pictures: Orlando nightclub shooting Orlando Police officers direct family members away from the nightclub AP In pictures: Orlando nightclub shooting The scene outside the Orlando gay club where multiple people have been shot AFP/Getty Images In pictures: Orlando nightclub shooting The injured are treated in the street outside Pulse in Orlando following the shooting EPA/Univision In pictures: Orlando nightclub shooting Two witnesses, Jermain Towns (left) and Brandon Shuford, wait down the street for news following shooting and hostage stand-off at the Pulse nightclub. Mr Towns said his brother was in the club at the time AP In pictures: Orlando nightclub shooting Emergency services at the scene. Ambulance crews and firefighters were outside the club alongside police. EPA In pictures: Orlando nightclub shooting People treating the wounded on the street EPA In pictures: Orlando nightclub shooting Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse night club Reuters In pictures: Orlando nightclub shooting Law enforcement agencies and local city representatives give a news conference in the wake of a mass-casualty shooting at the Pulse nightclub in Orlando Rex In pictures: Orlando nightclub shooting Orlando police officers seen outside of Pulse nightclub after a fatal shooting and hostage situation in Orlando, Florida Getty In pictures: Orlando nightclub shooting Friends and family console one another outside the Orlando Police Headquarters In pictures: Orlando nightclub shooting U.S. President Barack Obama speaks about the worst mass shooting in U.S. history that took place in Orlando REUTERS In pictures: Orlando nightclub shooting Imam Syed Shafeeq Rahman, the Imam of the mosqe that mass shooter Omar Mateen attended, speaks to the media in Fort Pierce. The imam said that the suspect never gave any indication he was capable of such violence.Omar Mateen attended evening prayers three or four times a week at the Islamic Center of Fort Pierce, bringing his son who is about four or five years old AFP/Getty Images In pictures: Orlando nightclub shooting Omar Mateen has killed 50 people at a gay nightclub after pledging allegiance to Isis in the deadliest mass shooting in US history Myspace

A gunman opened fire on a crowded nightclub in Orlando early Sunday, June 12. He killed at least 50 people. The final death toll is not known, but this shooting is already the deadliest mass shooting in the history of the United States. (Monica Akhtar/The Washington Post)

On Sunday morning, Mateen told NBC News that his son's rampage "has nothing to do with religion." Instead, he offered another possible motive. He said his son got angry when he saw two men kissing in Miami a few months ago. He said his son was especially enraged because the kissing took place in front of his own young son.

"We are saying we are apologising for the whole incident. We weren't aware of any action he is taking. We are in shock like the whole country," Mateen said.

Mateen could not be reached for comment by The Washington Post. His cellphone has been switched off.