In the first of what could be many legal challenges, three civil rights organizations sued Texas law  enforcement officials Tuesday in a bid to block a new law that lets state and local police arrest immigrants suspected of crossing the border illegally. Signed into law Monday by Gov. Greg Abbott, Senate Bill 4 is designed to give Texas immigration enforcement powers previously reserved for the federal government. Critics also worry it will lead to a rise in racial profiling and deprive people of due process. Under the new law, state judges can deport those found guilty of illegal entry or charge them with a class B misdemeanor.