http://www.nola.com/news/index.ssf/2016/04/pope_francis_says_shaking_bern.html

"This morning when I left, Sen. Sanders was there. ... He knew I was leaving at that time and I had the kindness to greet him and his wife and another couple who were with them," the pope told reporters traveling back with him to the Vatican.

"When I came down, I greeted them, shook their hands and nothing more. This is good manners. It's called good manners and not getting mixed up in politics. If anyone thinks that greeting someone means getting involved in politics, they should see a psychiatrist," the pope said.

<snip>

Sachs said Sanders saw the pope in the foyer of the domus, and that the encounter lasted about five minutes. Sanders later joined his family, including some of his grandchildren, for a walking tour of St. Peter's Basilica, one of the holiest Catholic shrines.