In a heated first presidential debate, incumbent US President Donald Trump and his Democratic rival Joe Biden attacked one another personally and traded barbs on topics such as the economy, border security, abortion, national security, and age. Biden criticized Trump for his controversial visit to a World War I cemetery and for allegedly calling fallen soldiers "losers" and "suckers," while Trump denied these claims and fired back at Biden for calling him a "criminal." The fiery debate set the tone for what promises to be a contentious presidential election in November.