There is no effort, because there was no political will to enforce the law under the Bush administration and now Obama has effectively neutered the BPS from doing their sworn duty under the law. The border is effectively lawless, unless you are a bonafide American citizen- then you can expect to be detained and searched at whim without probable cause.
But . . . but . . . What about Rick Perry—The fearless governor of Texas who is insulting Donald Trump from a safe distance?