Bradley Cooper Says Playing Chris Kyle Changed His Life

BEVERLY HILLS, CA - FEBRUARY 02:  Actor Bradley Cooper attends the 87th Annual Academy Awards Nominee Luncheon at The Beverly Hilton Hotel on February 2, 2015 in Beverly Hills, California.  (Photo by Frazer Harrison/Getty Images) (Photo: )
BEVERLY HILLS, CA - FEBRUARY 02: Actor Bradley Cooper attends the 87th Annual Academy Awards Nominee Luncheon at The Beverly Hilton Hotel on February 2, 2015 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images) (Photo: )

"American Sniper" was life changing, Bradley Cooper stated Monday at the annual Oscar Nominees Luncheon in Beverly Hills. And he wasn't talking about the film's unbelivable box office success. Even though "American Sniper" is now the highest-grossing war movie of all time (recently beating out "Saving Private Ryan"), Cooper took a much more emotional approach when a room full of journalists asked him if he was surprised at how heated the discussion about the film has become.

"You never know when you make a movie if anybody’s going to see it. So to have the audacity to think that it would cause any sort of effect would be pretty presumptuous," Cooper said.

"You also never think about whether you’re going to wind up here," Cooper said, referring to his place in the Best Actor race. "But you hope people are going to watch it and hope that it has some impact."

"Some impact" is an understatement. "American Sniper" has sparked debates and outcries from both sides of the political aisle. A U.S. soldier wrote an article for Salon titled "I was an American sniper, and Chris Kyle’s war was not my war."
Rolling Stone called it "almost too dumb to criticize" and Michael Moore argued that director Clint Eastwood "gets Vietnam and Iraq confused in his storytelling." Sarah Palin slammed "Hollywood leftists" as being "not fit to shine Chris Kyle’s combat boots," and the list goes on.

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But rather than comment on the drama behind the reactions to the film, Cooper got personal. "The responsibility to play a human being when his family is still alive and it’s still fresh was a huge endeavor and something that I knew was going to be important. I treated it in way I hadn’t before," he said. "Kyle was murdered two years to the day today, on Feb. 2, 2013."

Even Cooper's preparation for the role was different. He had tons of source material and wasn't just using his imagination. "[Kyle's] wife, Taya, gave us everything. I had thousands of hours of footage of him. So it was a completely different thing of allowing him to come inside me, basically," Cooper said.

"I just really loved this story," he continued. "And it’s changed over the years. He was murdered a year and a half into our development and it changed everything. It became a different movie. It became more about the plight of the soldier and his family."

Cooper said he was unsure if he's even fully absorbed the impact this film has had on him. "I don’t think I’ll realize it fully until maybe later in my life," he said. "It was life changing. Completely."

Bradley Cooper

Nominated for Best Actor in "American Sniper."
Nominated for Best Actor in "American Sniper."

Wes Anderson

Nominated for Best Director for "The Grand Budapest Hotel."
Nominated for Best Director for "The Grand Budapest Hotel."

Alejandro Gonzalez Inarritu

Nominated for best Director for "Birdman"
Nominated for best Director for "Birdman"

Richard Linklater

Nominated for best Director for "Boyhood"
Nominated for best Director for "Boyhood"

Bennett Miller

Nominated for best Director for "Foxcatcher"
Nominated for best Director for "Foxcatcher"

Morten Tyldum

Nominated for best Director for "The Imitation Game"
Nominated for best Director for "The Imitation Game"

Marion Cotillard

Nominated for Best Actress in “Two Days, One Night.”
Nominated for Best Actress in “Two Days, One Night.”

Felicity Jones

Nominated for Best Actress in "The Theory of Everything."
Nominated for Best Actress in "The Theory of Everything."

Julianne Moore

Nominated for Best Actress in "Still Alice."
Nominated for Best Actress in "Still Alice."

Rosamund Pike

Nominated for Best Actress in "Gone Girl."
Nominated for Best Actress in "Gone Girl."

Reese Witherspoon

Nominated for Best Actress in "Wild."
Nominated for Best Actress in "Wild."

Steve Carrell

Nominated for Best Actor in "Foxcatcher."
Nominated for Best Actor in "Foxcatcher."

Benedict Cumberbatch

Nominated for Best Actor in "The Imitation Game."
Nominated for Best Actor in "The Imitation Game."

Michael Keaton

Nominated for Best Actor in "Birdman."
Nominated for Best Actor in "Birdman."

Robert Duvall

Nominated for Best Supporting Actor in "The Judge."
Nominated for Best Supporting Actor in "The Judge."

Ethan Hawke

Nominated for Best Supporting Actor in "Boyhood."
Nominated for Best Supporting Actor in "Boyhood."

Edward Norton

Nominated for Best Supporting Actor in "Birdman."
Nominated for Best Supporting Actor in "Birdman."

Mark Ruffalo

Nominated for Best Supporting Actor in "Foxcatcher."
Nominated for Best Supporting Actor in "Foxcatcher."

JK Simmons Portrait Session

American actor in the 2014 Sundance Film Festival Audience Award and Grand Jury Prize-winning film "Whiplash" J.K. Simmons poses for a portrait, on Monday, Sept. 29, 2014 in New York. (Photo by Dan Hallman/Invision/AP)
American actor in the 2014 Sundance Film Festival Audience Award and Grand Jury Prize-winning film "Whiplash" J.K. Simmons poses for a portrait, on Monday, Sept. 29, 2014 in New York. (Photo by Dan Hallman/Invision/AP)

Patricia Arquette

Nominated for Best Supporting Actress in "Boyhood."
Nominated for Best Supporting Actress in "Boyhood."

Laura Dern

Nominated for Best Supporting Actress in "Wild."
Nominated for Best Supporting Actress in "Wild."

Keira Knightley

Nominated for Best Supporting Actress in "The Imitation Game."
Nominated for Best Supporting Actress in "The Imitation Game."

Emma Stone

Nominated for Best Supporting Actress In "Birdman."
Nominated for Best Supporting Actress In "Birdman."

Meryl Streep

Nominated for Best Supporting Actress in "Into The Woods."
Nominated for Best Supporting Actress in "Into The Woods."

This article originally appeared on HuffPost.