President Obama will deploy 1,200 National Guard troops and request an extra $500 million to secure the Mexican border, his administration said Tuesday, a move dismissed by Republicans as insufficient to win their cooperation on an overhaul of the nation's immigration system.

By reinforcing the 340 Guard members already monitoring border crossings and analyzing intelligence, the initiative echoes 2006's Operation Jump Start, in which President George W. Bush devoted 6,000 guardsmen to a two-year commitment in support of the Border Patrol.

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