President Donald Trump pumps his fist as he departs on the South Lawn of the White House, on December 12, 2020. Al Drago/Getty Images The mass exodus of corporate backing could affect how senators vote on Trump's impeachment trial, experts say. Dozens of companies have pulled funding from the GOP lawmakers who voted against Biden's certification. CEOs say they increasingly have no choice but to bring politics into the boardroom. Visit Business Insider's homepage for more stories. Moral convictions may not be the only reason that GOP lawmakers are turning their back on former President Donald Trump.Lawmakers who voted against certifying Joe Biden as president may also be rethinking their stance after losing corporate funding, experts told Insider.After Trump supporters stormed the US Capitol in a desperate bid to overturn the presidential election results, which turned into a violent insurrection leaving five people dead, businesses have been quick to cut ties with Trump and the lawmakers who backed his baseless claims of election fraud.Read more: Lawmakers, Hill staffers, and reporters recount the harrowing experience as a pro-Trump mob broke into the Capitol to protest the electoral-vote countWalmart, Amazon, and Morgan Stanley are among the companies that have cut off political funding to the 147 GOP lawmakers who voted against certifying Joe Biden as president.