Michael Keaton has called Donald Trump's presidency 'potentially frightening'
The Batman star described Mr Trump as a "genius manipulator" who tapped into America's "crushed" middle class during his election campaign.
Keaton, who describes himself as a "news and political junkie", said: "[I'm] nervous. Just a little bit nervous. It's so other worldly.
"What's scary about it is … how fast you can go from logical, reasonable through really difficult times, in an administration that deals with things, has disagreements but has discussions about things, to … all bets are off about anything.
It's pretty clear he's not one of you
"It's potentially frightening – the world as a result of what this particular person brings to it and everything surrounding it.
Keaton, who was nominated for an Oscar for his role in 2014 film Birdman, said it was "fascinating" that President Trump had successfully promoted "the notion that he's one of us".
The actor said: "How many of you have a jet, waiting for the jet to arrive?
The actor says Donald Trump is not 'one of us'
"It's pretty clear he's not one of you."
Get Quotes on Home Insurance
He added: "That's a legitimate thing that there are people out there who aren't making it. The middle class gets crushed. That's for sure correct.
"There's no question that Bernie Sanders and [Donald Trump] tapped into that."
Describing Mr Trump as a "genius manipulator", Keaton, 65, said: "He worked the media, worked them like Stooges.
Celebrities slamming Donald Trump Fri, January 20, 2017
From Meryl Streep to George Clooney, here's what the celebrities have to say about President-elect Donald Trump.
Play slideshow Getty 1 of 13
Robert De Niro, Cher and Alec Baldwin slam Donald Trump at the We Stand United NYC Rally
"Something, among other things, I Instagrammed over a year ago. I said: 'Just working you and you don't know he's working you.'
"So if that's a good thing, you've got to give him credit – if it's a good thing."
In his latest film The Founder, Keaton plays entrepreneur Ray Kroc who took a small fast food business in 1950s California owned by a pair of brothers and transformed it into the McDonald's empire.
:: The Founder is released in UK cinemas on Friday.
- Ivanka Trump slammed for THIS ‘inappropriate’ photo
- Donald Trump expects Russia to ‘return Crimea’ as he GETS TOUGH
- Putin 'deploys NEW MISSILES violating Cold War treaty'