MEXICO CITY (Reuters) -Mexico's senate erupted into violence on Wednesday with punches, pushing and shouting after an opposition party leader grabbed the chamber's president as the session was wrapping up.

Alejandro "Alito" Moreno, head of the opposition Institutional Revolutionary Party (PRI), came at senate president Gerardo Fernandez Norona, of the ruling Morena party, as lawmakers were singing the national anthem to mark the end of the day's hearing.

The fight broke out after a "difficult debate" about the presence of armed forces from other countries in Mexico, Fernandez Norona later told a press conference.

In livestreamed video, Moreno could be seen coming up to Fernandez Norona, repeatedly saying, "I'm asking you to let me speak," grabbing Fernandez Norona by the arm.

"Don't to

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