It will be interesting to see how all these issues will be resolved, but, in general, I believe our government has a vested interest in doing as thorough an investigation as possible into people attempting to enter the country, whether at the southern border, or at an international airport.  This may include searches which citizens on the street should never have to endure.  People who attempt to enter the country are doing so voluntarily, and it should be deemed that certain rights have been waived in exchange for admission.  I consider this reasonable.