Arrests of illegal immigrants crossing into the United States have nearly tripled in recent months — in anticipation of Congressional efforts to enact comprehensive immigration legislation, border patrol agents told CBS News Wednesday. “Once the first group gets across, they call their family, they call their friends and let them know, ‘Hey the time is right, come on over,’” Border Patrol agent and union representative Chris Cabrera told CBS News. In March, 7,500 illegals were arrested in the Rio Grande Valley of South Texas — which includes McAllen — Cabrera told CBS News. That’s up from 2,800 in January.