WASHINGTON (AP) - Donald Trump's campaign has called for Hillary Clinton to apologize and fire senior campaign officials involved in an email exchange that Republicans condemned as "breathtaking anti-Catholic bigotry."

The April 2011 email exchange details a conversation between current Clinton Communications Director Jennifer Palmieri and John Halpin, a senior fellow at the Center for American Progress, a Democratic think tank with close ties to the Clinton campaign and the Obama White House.

Halpin wrote that many conservative leaders are Catholic converts and called their positions "an amazing bastardization of the faith." Halpin added, "They must be attracted to the systematic thought and severely backwards gender relations and must be totally unaware of Christian democracy."

Palmieri, who was at the Center for American Progress at the time, responded that Catholicism "is the most socially acceptable politically conservative religion," adding that "their rich friends wouldn't understand if they became evangelicals."

Palmieri told reporters traveling with Clinton on Wednesday that she's Catholic and doesn't recognize the hacked email. Halpin also is a Catholic.