First, there are already laws to punish companies that hire unauthorized workers (not foreign workers without any qualifiers). See Immigration Reform and Control Act 1986 and Title 8 U.S.C. § 1324a. These laws are rarely enforced because under neoliberal doctrine it is better to create an entire underclass of cheap, exploitable labor that can be used as a scapegoat (under Republicans) during times of worker discontent and economic crisis. The immigration process should be streamlined and targeted to fill labor shortages and harshest penalties for hiring unauthorized workers on the owners and shareholders.
Second, a Christian does not involve themselves in the material world, that is the kingdom of Satan according to Christian doctrine. All governments fall under the kingdom of Satan, and all politicians are agents of Satan. A Christian does not concern themselves with these matters, they are obligated to follow the teachings of Christ, not the whims of a political party. This includes loving thy neighbor and treating immigrants with love and kindness, not disdain and contempt. Christians do not involve themselves in anything related to politics or government.
Should the laws be enforced? Yes, but that would result in corporate donors from both parties facing prison, and in the world of politics, Mammon is more important than Jesus. One could say, based on virtues alone, Trump is the “anti-Jesus” of our times.
Christianity as a religion is entirely spiritual, occupied solely with heavenly things; the country of the Christian is not of this world. He does his duty, indeed, but does it with profound indifference to the good or ill success of his cares. Provided he has nothing to reproach himself with, it matters little to him whether things go well or ill here on earth. If the State is prosperous, he hardly dares to share in the public happiness, for fear he may grow proud of his country’s glory ; if the State is languishing, he blesses the hand of God that is hard upon His people.
The Social Contract, Rousseau