Sheen, perhaps best known for playing fictional President Jed Bartlet on NBC’s The West Wing, was promoting a new documentary project from journalist Greg Palast, Vigilantes Inc.: America’s New Vote Suppression Hitmen, which claims that “self-proclaimed vigilante vote-fraud hunters” are seeking to challenge the votes of 851,000 people. Palast has said it is unclear if any of these challenges would go through, but enough could affect “the tiny margins” in the individual states.

“This is something that we really need to expand the public’s knowledge on and make them aware that this is going on and how egregious and illegal, not to mention immoral, it is,” Sheen said. “The fact that they are attacking newly registered voters, young people, people of color and immigrants, or people with foreign-sounding names, it’s very egregious, it’s racist, and it’s going to have a powerful effect on the outcome of the election.”

The film, which Sheen produced, also addressed the possibility of the Supreme Court overturning the results of the 2024 election, a scenario the actor said he is “absolutely” worried could happen. He then claimed that people cannot trust “a lot of this villainy” within the Republican Party.

Despite this, Sheen said he does not have “the slightest doubt” Vice President Kamala Harris will win the election, adding that he is not considering the possibility of a victory by former President Donald Trump.

The actor, who has called himself a “lifelong Democrat,” was previously one of multiple celebrities who starred in an ad encouraging voters not to vote for Trump in the 2016 presidential election, which Trump ended up winning.

Ahead of the 2024 presidential election, Trump and Harris are incredibly close in polling in Arizona, North Carolina, and Georgia, all of which are swing states. Both candidates have 49% support in North Carolina, while Trump has 1-point leads in Arizona and Georgia.