Celebrity Donald Trump Live-Trolls DNC Speakers on Twitter "Bernie Sanders totally sold out to Crooked Hillary Clinton," Trump wrote on Twitter By Stephanie Petit Stephanie Petit Stephanie Petit is a Royals Writer and Reporter at PEOPLE. People Editorial Guidelines Published on July 26, 2016 08:55 AM Share Tweet Pin Email Photo: Jim Watson/AFP/Getty Images The Republican National Convention is over, but Donald Trump is refusing to quietly yield the stage to the Democrats. The Republican presidential nominee live-trolled the Democratic National Convention on Twitter Monday, firing off criticism of speakers Cory Booker, Elizabeth Warren and Bernie Sanders, who wrapped up the evening with a speech supporting former rival Hillary Clinton. “Bernie Sanders totally sold out to Crooked Hillary Clinton,” Trump, 70, wrote. “All of that work, energy and money, and nothing to show for it! Waste of time.” “While Bernie has totally given up on his fight for the people, we welcome all voters who want a better future for our workers,” he said in another tweet. Sanders responded to the attack by simply writing, “Never tweet,” while quoting one of Trump’s comments. The business mogul attacked Warren, a Massachusetts senator who claims part Native American heritage, with the label “Pocahontas.” He claimed that despite the endorsement, Warren “always hated” Clinton. He also took aim at Booker, the New Jersey senator and former Newark mayor, who slammed Trump for his handling of casino bankruptcies in Atlantic City. “If Cory Booker is the future of the Democratic Party, they have no future,” Trump wrote. Related Video: VIDEO: When Was the Last Time Donald Trump Sang? Despite his Twitter crusade, Trump was notably silent on First Lady Michelle Obama, who gave an empowered and personal speech slamming Trump – without mentioning his name. “Don’t let anyone ever tell you that this country isn’t great,” she said in a pointed reference to Trump’s campaign slogan. “This, right now, is the greatest country on earth.” The first lady even mocked Trump for his use of the platform during her speech. “I want someone who understands that the issues a president faces are not black and white and cannot be boiled down to 140 characters,” Obama said.