The political and economic power wielded by the approximately 750 wealthiest people in America has become a sudden flash point in the 2020 presidential election, as the nation's billionaires push back with increasing ferocity against calls by liberal politicians to vastly reduce their fortunes and clout. On Thursday, Michael Bloomberg, a billionaire and former mayor of New York City, took steps to enter the presidential race, a move that would make him one of four billionaires who either plan to seek or have expressed interest in seeking the nation's highest office in 2020. His decision came one week after Sen. Elizabeth Warren (D-Mass.) proposed vastly expanding her wealth tax" on the nation's biggest wealth holders and one month after Sen. Bernie Sanders (I-Vt.) said America should not have any billionaires at all. The leaders of the anti-billionaire populist surge, Warren and Sanders, have cast their plans to vastly increase taxes on the wealthy as necessary to fix several decades of widening inequality. Financial disparities between the rich and everyone else have widened over the past several decades in America, with inequality returning to levels not seen since the 1920s, as the richest 400 Americans now control more wealth than the bottom 60 percent of the wealth distribution. At least 16 billionaires have in recent months spoken out against what they regard as the danger posed by the populist Democrats, particularly over their proposals to enact a "wealth tax" on vast fortunes.