buenos air argentina congress track pass pension reform measure monday even stone-throwing protesters rush police outside capitol build country main union call 24-hour general strike opposition proposal president mauricio macri elect 2015 mandate lift heavy-handed currency trade control favor predecessors say argentina need pension reform cut deficit attract investment promote sustainable growth debate bill suspend thursday due violent demonstrations macri promise decree bonus payment needy retire nothing satisfy opposition union activists march congress monday lawmakers debate proposal inside balaclava-wearing protesters use sling shots fire rock police answer water canon tear gas turn vast lawn front capitol battleground bill put millions retire risk change whole pension system laura rivas 34-year-old teacher tell reuters stand back violent protest areas go work years retire pension payments get minimal hurt us workers add others close front line shout attack macri accuse balance budget back poor score people injure include police officer dozens arrest authorities say macri cambiemos let change coalition majority congress expect cobble together enough vote approve bill monday tuesday measure already pass senate leave low house give final legislative approval opposition lawmakers join protesters dismiss bonus sweetener one-time bonus payment make march opposition lawmaker agustin rossi tell reporters add overall bill remain inadequate meet pensioners need 24-hour-long strike call argentina main cgt labor group start noon 1500 gmt threaten paralyze tuesday morning commuter traffic pension bill would change formula use calculate benefit payments would adjust every quarter base inflation rather current system twice-yearly adjustments link wage hike tax revenue economists say current formula mean benefit go line past inflation leave unchanged could harm macri efforts cut deficit propose formula benefit would increase percentage point inflation plan would take effect time low inflation expectations hence slow pace pension benefit increase macri aim cut fiscal deficit 3.2 percent gross domestic product next year 4.2 percent year reduce inflation percent 12 percent 20 percent year argentina set pass pension reform despite melee outside congress