Higbie also pushed the false Birther conspiracy about Barack Obama. Drudge Report promoted birther conspiracy theory that President Barack Obama was not a U.S. citizen. Walberg has repeatedly invoked "birther" conspiracy theories surrounding President Barack Obama's birth certificate. He has also pushed the false birther conspiracy about Barack Obama. The website gained notoriety for stoking false "birther" conspiracy theories about President Barack Obama. In 2011, Crowley said that birther conspiracy theories about Obama raised legitimate concerns. Trump was the most prominent promoter of birther conspiracy theories. Moon landing conspiracy theories have also been compared to the birther and 9/11 conspiracy theories. This action dovetailed with the birther movement started in 2008 repudiating Barack Obama's natural citizenship. He falsely accused Hillary Clinton of having started the "Birther" movement. Moderate conservatives have found themselves "bombarded with birther stuff". Mike Huckabee for president; Mandate to Save America; Birther Movement; and Risk Factors. The plot is a parody of the Birther Movement. While praised by "birther conspirators", reactions from mainstream commentators were negative.