He is a Breitbart propagandist and is the main person that is helping Bannon in his campaign to get Pope Francis to resign or at least sidelined because Francis could successfully oppose Bannon's campaign of bigotry and hatred against brown non-Christian people.  More interesting to me about this story is that it was first reported in Lifesite News which is run by Burke's buddies.  It is almost like there is an alliance between Burke and Bannon and their allies on these things.