President Donald Trump embarked on another Truth Social tear-up late Monday, posting more than 50 times in the dead of night about his political enemies, particularly Barack Obama . Ahead of his trip to China to meet with president Xi Jinping, and with the Iran war ceasefire hanging in the balance, the president again rehashed a series of long-running grievances on social media. Amid the flurry of conspiracy-minded messages he reposted from followers were baseless accusations that Obama had been involved in a “coup plot” by ordering the intelligence community to spy on him during his 2016 presidential run, that he ordered his Department of Justice not to prosecute Hillary Clinton after her emails were leaked, and that he had profited illegally from the Affordable Care Act.…