Canon Law 1398
All those who suggest or pass a law that promotes abortion, are automatically excommunicated.
Their excommunication does not have to be public. Their action is sufficient to incur the excommunication.
Accordingly, it can be said that most ex-Catholic politicians today are among the excommunicated. They cannot
be called Catholics because they no longer belong to the Catholic Church.
What prevents Biden from receiving the sacrements? Without official recognigion of his excommunication only his conscience would prevent him from receiving the sacrements.