Washington (CNN) — Attorney General Jeff Sessions, the top law enforcement officer in the country, participated in a chant of "Lock her up" Tuesday, reviving a rallying cry from Donald Trump campaign events calling to jail Hillary Clinton. Sessions was addressing a conservative group's high school leadership summit in Washington, where he promoted free speech and conservative principles. ~snip~ Then chants of "Lock her up" broke out. "Lock her up," Sessions said, chuckling at the brief interruption from the audience as the chant then grew louder. "I heard that a long time over the last campaign," he said before continuing...