also tonight, president biden speaking to world leaders at the u.n., now back in the oval office tonight. the key meeting with a u.s. ally, after the president made the case for the global fight against covid and future pandemics. the fight against climate change, warning we are nearing a point of no return. and what he said about the chaotic withdrawal from afghanistan. cecilia vega live from the white house. that breaking news as we come on in the death of gabby petito. the coroner identifying her body and determining her death was a homicide. tonight, news on the person of interest, where they re now searching. and the image captured by a wildlife camera. tonight, the chaos at the border. the department of homeland security now launching an investigation into those disturbing images of some border agents, images the white house called horrific. tonight, the response from the union representing those agents. and what president biden said when asked about the worsening s