What We're Following This Morning

Updated at 8:21 a.m. on September 22

Papal visit : President Obama and first lady Michelle Obama will welcome Pope Francis at Andrews Air Force Base this afternoon. It’s Francis’s first visit to the U.S. My colleague Emma has been noting his visit to North America here.

‘We totally screwed up’: That’s the admission from Michael Horn, the president and CEO of Volkswagen Group of America, as the automaker deals with the fallout from the revelation that it used software in its diesel cars to cheat on emissions tests. Shares in the automaker fell again today in Europe as officials called for an investigation into the company’s vehicles. Update: Volkswagen says 11 million vehicles worldwide are affected.

Brian Williams returns: The former anchor the NBC Nightly News returns to television tonight where he will lead MSNBC’s live coverage of the pope’s visit. NBC suspended Williams for six months after it emerged that he had lied about his experiences covering the war in Iraq in 2003.

Goldman Sachs CEO’s cancer diagnosis: Lloyd Blankfein says he has a “highly curable” form of lymphoma that was diagnosed late in the summer. In a statement, the Goldman Sachs CEO says his treatment will include chemotherapy over the next several months in New York.