The ex-minister of a Baptist church now attends as a transgender female. Can this person be ex-communicated? This person not currently in leadership. His presence is very difficult for his now-divorced wife and children. God Bless.
"It is actually reported that there is sexual immorality among you, and such sexual immorality as is not even named among the Gentiles--that a man has his father's wife! And you are puffed up, and have not rather mourned, that he who has done this deed might be taken away from among you" (I Corinthians 5:1-2).
For a man to pretend to be a woman, even going so far as to change his physical appearance with surgery and drugs, is a sin. "A woman shall not wear anything that pertains to a man, nor shall a man put on a woman's garment, for all who do so are an abomination to the LORD your God" (Deuteronomy 22:5). For more on this matter see: Is it wrong to have a sex change?
Because he is persisting in his sin, he must be withdrawn from. For a church not to do so is to give permission to sin. "Your glorying is not good. Do you not know that a little leaven leavens the whole lump? Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us" (I Corinthians 5:6-7).