Authorities are fortifying the nation's capital ahead of Biden’s big day, including having up to 15,000 armed National Guard members on the Capitol grounds as potential threats of violence grow. LEARN MORE: Lawmakers briefed on multiple potential threats to Congress between now and inauguration: https://abcn.ws/3oIEfoq Trump impeachment live updates & stream ABC News Live here: https://abcn.ws/3qfr0Ml Subscribe to GMA's YouTube page: https://bit.ly/2Zq0dU5 Visit GMA's homepage: https://www.goodmorningamerica.com #GMA #WashingtonDC #InaugurationDay #Inauguration2021 #BidenHarris