The U.S. government and TikTok will go head-to-head in federal court on Monday as oral arguments begin in a consequential legal case that will determine if – or how — a popular social media platform used by nearly half of all Americans will continue to operate in the country.Attorneys for the two sides will appear before a panel of judges at the federal appeals court in Washington. TikTok and its China-based parent company, ByteDance, are challenging a U.S. law that require...