Can. 915 Those who have been excommunicated or interdicted after the imposition or declaration of the penalty and others obstinately persevering in manifest grave sin are not to be admitted to holy communion.
A Primer on Canon 915
Archbishop Raymond Burke first conducted private communications to three 'Catholic' legislators, imploring them, "to make their consciences correct with Magisterial teachings." After all three politicians refused to meet with him, saying they instead reject the Church's infallible teachings, Bishop Burke, as 'Priest, Prophet and King,' then took the necessary steps to issue the four paragraph 'canonical notification' to address the scandal they were causing in his diocese by their conduct 'which is seriously, clearly and steadfastly contrary to the moral norm' (EE n.37).
The notification declares: "...Catholic legislators who are members of the faithful of the Diocese of La Crosse and who continue to support procured abortion or euthanasia may not present themselves to receive Holy Communion. They are not to be admitted to Holy Communion, should they present themselves, until such time as they publicly renounce their support of these most unjust practices" (canon 915).
Burke exhorted, "No good bishops could stand by and let this happen. These public legislators are in grave sin."