Hollywood celebrities cheered their approval when major league baseball players took a knee during Thursday’s season opening games on both sides of the country. The players, who were sometimes joined by their coaches, knelt during the playing of The Star-Spangled Banner. The kneeling was their way of paying tribute to the Black Lives Matter movement as well as to former NFL star Colin Kaepernick, who started the trend when he began kneeling during the national anthem at football games. President Donald Trump has expressed his disapproval of kneeling during the national anthem, saying that he will stop watching sporting events...