Alex told Insider about his interactions with the Trumps.
He saw how the family reacted to Trump's loss.
Some of them were bitter and others didn't want to discuss it.
The British filmmaker who had access to the family said Donald Trump's children were torn between denial and rage after he lost the election.
Alex was filming the Trump campaign and interviewing the former president and his family as part of a secret project documenting the 2020 election and its aftermath.
After the panel obtained his footage, his work was revealed during the January 6 committee hearings.
In a Tuesday interview with Insider, Holder said that he saw a mixture of reactions among Trump's three oldest children.
One of them would give an attitude that was bitter and angry about the result.
"Then there were the other children who were totally in denial and would not even refer or discuss or engage with anything to do with the fact that they were no longer in the White House."
He didn't specify which children he meant for. His descriptions were in line with reports about the Trump children.
Donald Trump's two oldest sons, Don Jr. and Eric, have supported their father in his claims.
In a series of text messages, Don Jr. encouraged Mark to try to overturn his father's election loss
In an interview with The Independent, Eric said that he wasn't concerned about potential violence from Trump supporters.
According to The New York Times, in the final weeks of Trump's presidency, Ivanka and her husband kept their distance from the administration.
Trump's daughter said in the documentary that her father should keep up his challenges until every legal remedy is exhausted.
The footage was taken in the year 2020.
She told the January 6 committee that she accepted the results of the election after William Barr said there was no election fraud.
After it was revealed that his footage was subpoenaed by the House select committee, he found himself at the center of a political storm. He gave testimony before the panel in private.
The Trump Organization didn't reply immediately.
On July 10, the Discovery+ streaming service will show the documentary in its entirety.
Business Insider has an article on it.