By Rolling Stone Megadeth leader Dave Mustaine has made no secret of his right-of-center political views, but the singer took an ugly conspiratorialist turn last week in Singapore when he said on stage during a concert Aug. 7 that President Obama is behind recent shooting rampages near Denver and Milwaukee, TMZ reports. "My president," Mustaine began, before pausing to pantomime gagging, "is trying to pass a gun ban, so he's staging all of these murders, like the Fast and Furious thing down at the border, you know, Aurora, Colorado, all the people that were killed there. And now the beautiful people at the Sikh temple." Twelve people were killed and 58 wounded July 20 in Aurora when a gunman opened fire inside a movie theater during a midnight screening of "The Dark Knight Rises." The suspect, James Holmes, has been charged with 24 counts of first-degree murder and 116 counts of attempted murder. Six people were killed and four wounded Aug. 5 in Oak Creek, Wisc., when a gunman identified as Wade Page, a white supremacist, opened fire at Sikh temple, then killed himself. Fast and Furious was part of a federal sting operation intended to trace the movement of weapons from legal dealers in the United States to the leaders of Mexican drug cartels. The government lost track of some weapons, which were later found at crime scenes in Mexico. Mustaine went on to muse about where he was going to live "if America keeps going the way it's going, because it looks like it's turning into Nazi America." His comments in Singapore weren't the singer's first foray into right-wing conspiracy theories: Mustaine has also expressed "birther" sentiments about Obama's citizenship. "I know he was born somewhere else than America," Mustaine said in March on a Canadian talk show.