The pontiff lived up to his reputation for blunt talk at a welcoming ceremony at the White House, introducing himself as the son of the kind of "immigrant family" on which America was built -- a clear reference to the controversy swirling around millions of undocumented people in the country.
And in comments that could antagonize Republicans, Francis endorsed President Barack Obama's efforts on climate change and rebuilding ties with Cuba after more than half a century of estrangement.
