US Vice President Kamala Harris says she will do “everything in my power” to defeat Donald Trump, as she accepts President Joe Biden’s endorsement following his withdrawal from the 2024 race. Harris’ statement came a little more than two hours after Biden announced he was stepping aside following weeks of mounting pressure from Democrats worried about his ability to win a second term. “I am honored to have the president’s endorsement and my intention is to earn and win this nomination,” she said. Democrats hold their national convention next month in Chicago to officially choose the party’s no…