Donald Trump on Wednesday was accused of violating the law after posting a letter he received from a foreign leader. Trump late on Tuesday evening posted on social media a letter from an unlikely source: Palestinian leader Mahmoud Abbas. Trump has previously used the word “Palestinian” as a slur against his enemies. “It is with grave concern that I have received news and later on watched footage of your attempted assassination,” Abbas wrote in the letter. “Acts of violence must not have a place in a world of law and order.” Want more breaking political news? Click for the latest headlines at R…