Extreme heat bears down as America 250 celebrations ramp up. Trump heads to Mount Rushmore

America's 250th independence anniversary celebrations are underway amid extreme heat, with President Donald Trump set to speak at Mount Rushmore and Mayor Zohran Mamdani addressing the milestone in New York City. Events include fireworks and military flyovers, but heat warnings have led to cancellations and adjustments in parts of the Midwest and East Coast.