WASHINGTON - President Donald Trump said Friday that he is willing to provide Joe Biden, his presumptive Democratic opponent, with a rapid COVID-19 testing system so Biden can return to the campaign trail. Trump, who this week made his first trip out of Washington in more than a month, relies on a federal supply of coronavirus tests so that he can maintain a more traditional schedule, while Biden has been isolating at home for nearly two months. In a telephone interview with “Fox & Friends,” Trump said he would be willing to provide the former vice president with the same...