Leonardo DiCaprio, Robert De Niro get political during Hollywood awards gala

Award season began in Hollywood on Sunday with the 20th annual Hollywood Film Awards.

Winners such as Leonardo DiCaprio and Robert De Niro used their speeches to urge American voters to vote this Tuesday.

READ MORE: Alberta oilsands prominently featured in DiCaprio climate change film

Accepting an award for his documentary “Before the Flood,” DiCaprio talked about climate change as “an urgent threat to life on earth as we know it.”

“Please vote on November 8th,” said the 41 year-old. “Vote for people who believe in the science of climate change.”

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READ MORE: De Niro says he’d like to punch Trump ‘in the face’

Robert De Niro openly urged support for Hillary Clinton on stage.

The 73-year-old used his speech to compare the possibility of a Donald Trump president to the “insane” character in the Stanley Kubrick movie ”Dr. Strangelove” from 1964.

“Wacky comedies right? Well, not so fast”, said the actor.

“We have the opportunity to prevent a comedy from turning into a tragedy,” he said.

WATCH: Robert De Niro compares Trump to ‘lunatic’ leaders in ‘Dr. Strangelove,’ ‘Duck Soup’

0:22 Robert De Niro compares Trump to ‘lunatic’ leaders in ‘Dr. Strangelove,’ ‘Duck Soup’

-With files from The Associated Press