The 41-year-old actor portrayed Navy SEAL Chris Kyle in the 2014 biopic, American Sniper -- directed Clint Eastwood, an outspoken Republican -- and is considered by some to have a conservative point of view. Cooper admitted on Tuesday's Late Late Show With James Corden that he "was not expecting" such an adverse reaction to his appearance at the DNC in his hometown of Philadelphia, Pennsylvania.
Cooper said that he and his mother, Gloria Campano, attended the event to see President Barack Obama speak. His Russian model girlfriend, Irina Shayk, was also in attended. "Republicans were up in arms because I was there listening to the president speak," Cooper explained. "I think he was an incredible president. I was really excited."
Hangover director Todd Phillips joined the actor on the Late Late Show couch, and offered up a funny comparison regarding the controversy. "That's like the mob being mad at [Robert] De Niro for being in The Intern," he quipped.
Cooper and Phillips also recalled a dinner they had with former President Bill Clinton while filming Hangover 2 in Thailand. Phillips said that Hillary Clinton's husband admitted to being a fan of the 2007 comedy Who's Your Caddy, while Cooper remembered the 69-year-old politician jokingly asking to be in the A-Team sequel.
NEW YORK, NY - JUNE 07: Actors Bill Nighy (L) and Bradley Cooper attend American Theatre Wing's 69th Annual Tony Awards at Radio City Music Hall on June 7, 2015 in New York City. (Photo by Mark Sagliocco/Getty Images)
NEW YORK, NY - MARCH 21: Bradley Cooper and Jennifer Lawrence attend the after party of a screening of 'Serena' hosted by Magnolia Pictures And The Cinema Society With Dior Beauty on March 21, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MAY 06: Actors Bradley Cooper and Victor Garber attend Sardi's Caricature Unveiling at Sardi's on May 6, 2015 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
WASHINGTON, DC - JANUARY 13: Taya Kyle (L) and Bradley Cooper attend the opening of 'American Sniper' at the Burke Theater at the U.S. Navy Memorial on January 13, 2015 in Washington, DC. (Photo by Larry French/Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0187 -- Pictured: (l-r) Actor Bradley Cooper during an interview with host Jimmy Fallon on January 5, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
WASHINGTON, DC - JANUARY 13: Bradley Cooper attends the opening of 'American Sniper' at the Burke Theater at the U.S. Navy Memorial on January 13, 2015 in Washington, DC. (Photo by Larry French/Getty Images)
NEW YORK, NY - DECEMBER 15: Actors Sienna Miller and Bradley Cooper attend the 'American Sniper' New York Premiere at Frederick P. Rose Hall, Jazz at Lincoln Center on December 15, 2014 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
Actor Bradley Cooper during an interview with host Jimmy Fallon on January 5, 2015. (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - DECEMBER 07: (L-R) Bradley Cooper, Patricia Clarkson and Alessandro Nivola attend 'The Elephant Man' Broadway Opening Night - Curtain Call at the Booth Theater on December 7, 2014 in New York City. (Photo by Ben Gabbe/Getty Images)
NEW YORK NY - NOVEMBER 12: Bradley Cooper sighting on November 12, 2014 in New York City.
(Photo by Josiah Kamau/BuzzFoto/FilmMagic)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0148 -- Pictured: (l-r) Actor Bradley Cooper and host Jimmy Fallon play 'Egg Russian Roulette' on October 17, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
LONDON, ENGLAND - SEPTEMBER 15: Anna Wintour, Suki Waterhouse and Bradley Cooper head to J Sheeky restaurant for dinner on September 15, 2014 in London, England. (Photo by Keith Hewitt/GC Images)
NEW YORK, NY - MARCH 08: (L-R) Actors Bradley Cooper, Abbie Cornish and Robert De Niro attend Relativity Media's world premiere of 'Limitless' presented by DeLeon Tequila at Regal Union Square Theatre, Stadium 14 on March 8, 2011 in New York City. (Photo by Larry Busacca/Getty Images for Relativity Media)
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While Cooper seems unfazed by the hoopla surrounding his DNC appearance, Blake Shelton went on a Twitter rant last week after a few of his fans, including Debra Messing, assumed he was a Donald Trump supporter. Here's what the country crooner had to say about his political views: