Billie Joe Armstrong

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Green Day singer Billie Joe Armstrong told the British magazine Kerrang that Donald Trump is just like Adolf Hitler. (Instagram, Billie Joe Armstrong)

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Billie Joe Armstrong of Green Day performs at the iHeart Radio Music Festival at the MGM Grand Arena in Las Vegas on Friday, Sept. 21, 2012. (Eric Reed/Invision/AP)

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Green Day has canceled its remaining concerts this year, Billie Joe Armstrong is in substance abuse treatment. (Associated Press)

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** FILE ** This Sept. 21, 2012, file photo shows Billie Joe Armstrong of Green Day on stage at the iHeart Radio Music Festival at the MGM Grand Arena in Las Vegas. Green Day has canceled its upcoming performance in New Orleans. The band was scheduled to headline the Voodoo Music + Arts Experience at City Park on Oct. 27 but a spokesman for the group announced Tuesday the performance was being canceled. The announcement comes less than a month after the band’s front man Billie Joe Armstrong headed into treatment for substance abuse. (Photo by Eric Reed/Invision/AP, file)

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Billie Joe Armstrong of Green Day performs at the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nev., on Friday. (Associated Press)

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Billie Joe Armstrong of Green Day performs Sept. 21, 2012, at the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas. (Associated Press/Clear Channel, Andrew Swartz)

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Billie Joe Armstrong of Green Day attends the MTV Video Music Awards on Thursday, Sept. 6, 2012, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

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Billie Joe Armstrong

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**FILE** Billie Joe Armstrong (right) sits July 25, 2012, with Christina Aguilera. Armstrong will join Aguilera as her team's mentor this season on NBC's "The Voice." (Associated Press/NBCUniversal)

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FILE - In this June 13, 2010 photo, Billie Joe Armstrong of the rock band Green Day appears onstage at the 61st Annual Tony Awards in New York. (AP Photo/Richard Drew, File)

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FILE - In this Sept. 13, 2010 file photo, Billie Joe Armstrong of Green Day performs with cast members of the Broadway musical "American Idiot" at halftime during an NFL football game between the New York Jets and the Baltimore Ravens at New Meadowlands Stadium in East Rutherford, N.J. Green Day front man Billie Joe Armstrong is joining the cast of "American Idiot," the Broadway show he helped create based on the band's 2004 Grammy-winning album, The Associated Press reported Sunday, Sept. 26, 2010. (AP Photo/Henny Ray Abrams, File)