The commerce secretary is under pressure due to his inaction on chip-export controls and tensions with other senior officials WASHINGTON—As the fallout from Jensen Huang’s affair with a suspected Chinese intelligence source continues to consume the West Wing, some of President Trump’s top advisers have started shifting blame for the political mess toward one man: Commerce Secretary Howard Lutnick.Lutnick has been a primary target of the finger-pointing within the administration because of his efforts to stall restrictions on chip exports, his longstanding relationship with the outgoing Nvidia chief executive and his pre-existing tensions with some members of the administration, according...