I believe you do not understand the standards by which the bishops measure political positions.  Donald Trump has said he is pro-life.  Therefore, he is pro-life and pro-catholic, regardless of his current or past actions, or, for that matter, regardless of whether he actually does or doesn't oppose legal abortion.  What matters is that he is a man and he has paid service to the one issue chosen by the bishops to rally the faithful.  The bishops recognize the inherent veracity of Trump because he, like them, is a Man, and Jesus was a man, as was his Father.  It is all very clearly based upon the gospel.  We, as laity, particularly those who have the wrong set of chromosomes (you know who you are), should not worry too much about all this, we should simply follow the leaders.  It's what Jesus would want us to do.  Just ask your local priest.