Washington -- The infighting and backstabbing that plagued President Donald Trump’s first term have returned as a threat to his second, with deepening fissures over trade, national security and questions of personal loyalty. The latest turmoil threatens to engulf the Pentagon, where Defence Secretary Pete Hegseth has pushed out top advisers and faces fresh controversy over sharing sensitive information about airstrikes in Yemen outside of classified channels. A former Pentagon spokesperson who was ousted last week wrote in Politico that Trump should fire Hegseth for presiding over a “full-blown meltdown.” The interpersonal drama is not - at least yet -...