Former President Donald Trump has made a disturbing shift in his 2024 presidential campaign stump speeches, according to a rhetorician raising the alarm about authoritarianism. “He’s running as a dictator,” Professor Jennifer Mercieca told progressive commentator Aaron Rupar, “He’s determined to destroy the Constitution.” Rupar published Thursday his takeaways from a conversation with Mercieca after a primary night Tuesday that confirmed Trump and President Joe Biden will once again face off in a race to claim the White House in 2025. The interview also took place after new reports revealed Tr…