KNOW IT ALL: Tuesday's Top 7 Stories at NBC News

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Good morning. Here are the top headlines from NBC News.

1. Pope Francis Begins Historic U.S. Visit

He’ll visit Washington, New York and Philadelphia on a six-day tour. On the itinerary are a meeting with the president, an address to Congress, a speech at the United Nations and visits with immigrants, prisoners and the homeless. Read more in NEWS.

2. Where the Pope Will Make News

On Wednesday, Francis will make a saint of an 18th century missionary who spread Christianity through the West. He’ll also visit a Catholic school in East Harlem and give a speech at Independence Mall in Philadelphia. Read more in NEWS.

3. Why Did Scott Walker Fall So Suddenly?

The Wisconsin governor quit the presidential race on Monday, leaving 15 Republicans contending for the nomination. His exit was the result of a death spiral of low poll numbers and evaporating cash. Read more from MEET THE PRESS.

4. VW Says 11 Million Vehicles Could Have Bad Software

The automaker says it’s setting aside $7.3 billion to cover the fallout. American regulators revealed last week that VW rigged almost half a million cars to beat smog tests. Read more in BUSINESS.

5. Kentucky Clerk Kim Davis Is Meddling, ACLU Says

She went back to work after pledging that she wouldn’t interfere with deputies issuing marriage licenses to same-sex couples. But the American Civil Liberties Union says in a court motion that she’s doing just that. Read more in NEWS.

6. Deaths of Six in South Dakota Ruled Murder-Suicide

A couple and four children were found dead in their South Dakota home as it burned to the ground on Sept. 17. Authorities now say that the father apparently shot the five others before killing himself. Read more in NEWS.

7. FDA Warns About Pain Pill in Kids

The government says it’s investigating a pill called tramadol because children can develop dangerously slow breathing after using it. The drug is not approved for children, but the FDA says doctors prescribe it anyway. Read more in HEALTH.