It is not his role to turn anyone away from the communion table. It is the responsibility of the penitent to accept the body of Christ with a clear conscience.
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Not true.
http://en.wikipedia.org/wiki/Canon_915
The priest does not know each person who comes for communion. It remains the primary duty of the penitent to insure his or her preparedness to receive the sacrament.
The Canon you list specifically describes those who are in a state of excommunication or interdiction. Neither of these are true of Pelosi or Biden.