WASHINGTON — Tensions flared Saturday night as supporters of President Donald Trump and his unfounded claims of voter fraud clashed with counterprotesters in the streets of the nation's capital.Thousands of Trump supporters gathered earlier in the day to protest the result of the , marching in the afternoon from Freedom Plaza to the Supreme Court, where Republican lawmakers and party leaders addressed the largely unmasked crowd.More from NBC News:By nightfall, local police officers were seen wearing riot gear, and at least one person was stabbed when a fight broke out between two large...…WASHINGTON — Tensions flared Saturday night as supporters of President Donald Trump and his unfounded claims of voter fraud clashed with counterprotesters in the streets of the nation's capital.Thousands of Trump supporters gathered earlier in the day to protest the result of the , marching in the afternoon from Freedom Plaza to the Supreme Court, where Republican lawmakers and party leaders addressed the largely unmasked crowd.More from NBC News:By nightfall, local police officers were seen wearing riot gear, and at least one person was stabbed when a fight broke out between two large...WW…