The Guardian's live blog leads on Chris Van Hollen announcing a challenge to Chuck Schumer for Senate majority leader, which Schumer, saying he has the votes, answered within a minute. Among the day's other news: Jensen Huang resigns as Nvidia's chief executive over affair reports, drawing investigations from Ron Wyden and Richard E Neal into the Trump administration's Nvidia chip-export scheme; Trump, in a Stephen A Smith interview, defends the Iran war and rejects a deal; Democrats gather in Denver after midterm wins including Cindy Holscher's Kansas governorship; and the outgoing Republican Senate confirms Trump's judicial nominees.