WASHINGTON — The Supreme Court said Monday it will hear a case in which a man tried to trademark a phrase mocking former President Donald Trump as “too small.”The Justice Department is supporting President Joe Biden’s once and possibly future rival in urging the court to deny a trademark for the suggestive phrase “Trump too small” that a California man wants to put on T-shirts.The case will be argued in the fall, one of two disputes on the court’s upcoming agenda that involve Trump …