MEXICO CITY — Mexican senators voted early Wednesday to abolish the country’s judicial system and allow citizens to choose nearly all judges, a drastic change that U.S. officials say could pose “a major risk” to its democracy.

       The crucial decision came after protesters stormed the chamber yelling “Traitors!”

       The leftist ruling party, Morena, barely mustered the two-thirds vote required for the constitutional amendment. Eighty-six lawmakers voted in favor; 41 voted against.