President Donald Trump and Democratic challenger Joe Biden debated over how to tame the contagious novel coronavirus during the campaign’s closing debate, which is also the final one ahead of the crucial US presidential debates. As the debate swept to climate change, Trump explained his decision to pull the U.S. out of the Paris climate accord negotiated in 2015, declaring it was an unfair pact that would have cost the country trillions of dollars and hurt businesses. For more, watch the full video of First Up.