On Saturday, Gaffigan will perform for an audience that may include Pope Francis. A practicing Catholic, the comic says faith is a central part of his humor.
The pope spoke for 51 minutes before Congress and read his speech verbatim from prepared remarks. That is, except for one line he omitted about politics not being "a slave to the economy and finance."
In a nearly hourlong speech, Pope Francis called for action on climate change, encouraged empathy for immigrants and advocated for the poor. He also said he supports abolishing the death penalty.
When it comes to abortion, hunger, war, immigrants who drown, the sick and the environment, "it is wrong to look the other way or remain silent," Francis said.
Calling them "four representatives of the American people," Pope Francis lauded Dorothy Day and Thomas Merton alongside Martin Luther King Jr. and Abraham Lincoln.
Pope Francis' visit to Washington marks the 29th time a pope has sat down for a meeting with a president of the United States. As usual, politics will provide the backdrop.
Pope Francis arrives in the U.S. on Tuesday. From his reception at Joint Base Andrews in Maryland to a meeting with immigrants in Philadelphia, here's a look at moments that could prove momentous.