Just to bring a proper perspective to the authority of a bishop, here are a few excerpts from the Catholic Encyclopedia:
"A bishop is forbidden to exercise the Pontificalia, i. e. to perform episcopal functions in another diocese without the consent of the ordinary, i.e. the proper bishop (Council of Trent, Sess. VI, De ref., ch. v). [This of course precludes a bishop from attempting to tell Catholics in another diocese that they must support illegal immigration.]
"He has not, it is true, the right to define, outside an ecumenical council, controverted questions with regard to faith and morals [e.g., support of illegal immigration], but when a heated discussion arises in his diocese, he can impose silence upon the parties concerned while awaiting a decision from the Holy See.
“The bishop can enact for his diocese those laws which he considers conducive to the general good. Though he is not bound to convoke a synod for this purpose his legislative power is not absolute. He cannot legislate contra jus commune, i.e. enact a law contrary to the general law of the Church, written or established by custom, or to the decisions of general, plenary, or provincial councils. This is on the principle that an inferior cannot act contrary to the will of his superiors (ch. ii, De electione et electi potestate”, I, iii, in the Clementines; Friedberg, II, 1135)
"In his diocesan legislation the bishop must not go beyond the purpose intended by the common ecclesiastical law.
"The bishop [can dispense], however, [he] cannot dispense from enactments that relate directly to himself, and impose obligations upon him, or from enactments that accord rights to a third party.
“The bishop has also obligations regarding the Holy See. Throughout his entire administration he must conform to the general legislation of the Church and the directions of the pope.” [And of course no pope teaches us to support illegal immigration].
See also the Catechism, e.g., 1879, 1880, 1897,1898,1899,1900, by which bishops are bound.
PS:Thanks, Eric, we needed that.