Kamala Harris, Donald Trump debate in Philadelphia (10 images)

The Republican presidential nominee, former President Donald Trump, shakes hands with the Democratic presidential nominee, Vice President Kamala Harris, before their debate at the National Constitution Center in Philadelphia on September 10, 2024. Pool Photo by Win McNamee/UPI

"I have traveled the world as vice president of the United States and world leaders are laughing at Donald Trump," Harris said during the debate. Pool Photo by Win McNamee/UPI

"We're a failing nation. We're a nation that's in serious decline," Trump said during the debate. Pool Photo by Win McNamee/UPI

The vice president placed the blame on Trump for killing a border security bill that the Biden administration supported and would have increased the number of border patrol officers and resources at the southern border. Pool Photo by Win McNamee/UPI