A month of harsh words between Rep. Patrick Kennedy and a strident critic, Roman Catholic Bishop Thomas Tobin, escalated recently when the bishop acknowledged asking Kennedy not to receive Holy Communion because of the Democratic lawmaker’s support for abortion rights.

The bishop’s attempt to publicly shame Kennedy on his abortion stance comes just a few months after the death of his father, Sen. Edward Kennedy of Massachusetts. Tobin told The Associated Press that the younger Kennedy, who has been in and out of treatment for substance abuse, has been acting “erratically.”

Their dispute began in October when Kennedy criticized the nation’s Catholic bishops for threatening to oppose an overhaul of the nation’s health care system unless lawmakers included tighter restrictions on abortion, which have since been added to the House version of the bill. Tobin said he felt Kennedy made an unprovoked attack on the church and demanded an apology.

“The point is, because of his obstinate … public support of abortion, which is clearly contrary to an essential teaching of the church of a matter of critical morality … he is then not properly prepared to receive Holy Communion,” Tobin said in an interview Sunday. “No one has a right to receive Holy Communion.”

The feud escalated after Kennedy told The Providence Journal in a story published Sunday that Tobin instructed him not to receive Communion. Kennedy also claimed the bishop had told diocesan priests not to give him communion, an allegation that Tobin denied.