MOSCOW (Reuters) -The row between Donald Trump and Elon Musk was triggered by months of intense stress on both sides, and the public battle between the U.S. president and the billionaire donor needs to stop, Musk's father told Reuters on Monday. Trump and Musk began exchanging insults last week on social media, with the Tesla and SpaceX CEO describing the president's sweeping tax and spending bill as a "disgusting abomination". Asked whether he thought his son had made a mistake by engaging in a public row with the president, Errol Musk said people were sometimes unable to think as clearly as they should "in the heat of the moment."