Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Biden, Sanders Clash on Best Way to Defeat Trump Ken Bredemeier The last two major U.S. Democratic presidential candidates -- former Vice President Joe Biden and Vermont Sen. Bernie Sanders -- clashed Sunday night in a spirited debate on a range of issues as they made their best case to be the party's nominee to face Republican President Donald Trump in November's national election. The two candidates attacked Trump repeatedly, with Biden calling him "an existential threat to the country," while Sanders declared that Trump is a "pathological liar" overseeing a "corrupt administration." Both assailed Trump's handling of the coronavirus pandemic in the U.S., with Sanders accusing him of "undermining scientists" and Biden faulting the administration for refusing in the early stages of the crisis to import test kits from other countries when the U.S. had the opportunity to do so. .