Pope Francis began his papacy in 2013 during the Obama administration, but former President Barack Obama is not planning to attend, according to a spokesman.

With his upcoming funeral, Pope Francis will one last time force the world to take a look at two U.S. Presidents who represent vastly different approaches to the job.

The clash in style between Donald Trump and Pope Francis and their positions on migration, the environment and poverty will come into sharper focus as the president travels to Rome for Francis' funeral.