New Delhi, Aug. 28 -- Mexico's Senate erupted into chaos on Wednesday (August 27) as opposition party leader Alejandro "Alito" Moreno clashed physically with Senate President Gerardo Fernandez Norona, leaving lawmakers shocked.

The altercation occurred at the end of a contentious debate over the presence of foreign armed forces in Mexico. Fernandez Norona, of the ruling Morena party, described the session as a "difficult debate" before the physical confrontation.

Moreno, head of the opposition Institutional Revolutionary Party (PRI), became angry after he was denied a chance to speak. As lawmakers began singing the national anthem to mark the close of the session, Moreno approached Fernandez Norona.

"I'm asking you to let me speak," Mo...