President Donald Trump and former Vice President Joe Biden will square off in a debate for the final time before Election Day. The rules will be different this time, as well. One candidate’s microphone will be muted for the first two minutes of each segment to allow the other an uninterrupted answer. A rapidly growing wildfire prompted mandatory evacuations in northern Colorado and is threatening to merge with the state's largest wildfire in history, fire officials said. The United States has sanctioned five Iranian groups that it says attempted to interfere in the upcoming presidential election between President Donald Trump and Democratic candidate Joe Biden. Plus, new research shows certain masks do work against the spread of Covid-19.