The CDC has traced 55 of cases of illness to a Campylobacter infection spread by puppies, including some from Petland pet stores. David Highfield of CBS Pittsburgh station KDKA reports. Source

Facebook Oversight Board upholds Trump ban; After health issues, mother and daughter climb Mount Everest Source

English singer-songwriter Ed Sheeran has sold more than 26 million albums and won two Grammy Awards. Sheeran sits down with Charlie Rose on Rose’s PBS program to discuss his career. Source

Petty, best known as the frontman of Tom Petty and the Heartbreakers, went into cardiac arrest and couldn’t be revived, the band’s longtime manager said Monday. Petty died at age 66 surrounded by family, his bandmates and friends, according to a statement. Source

Las Vegas officials say that ammonium nitrate, which can be mixed with fuel oil to create explosives, was found in the car of alleged concert shooter Stephen Paddock. CBS News security analyst and former Assistant FBI Director Ron Hosko spoke to CBSN about the ongoing investigation into Paddock’s motives. Source

CBSN political contributor and Boston Herald columnist Michael Graham joins CBSN along with Sean Sullivan of The Washington Post, to discuss calls for tighter gun regulation in the wake of a deadly mass shooting in Las Vegas that left dozens dead. Source

Las Vegas police gave an update on the investigation following the mass shooting at Mandalay Bay Resort & Casino on Sunday night. Police released details on how to help the victims of the attack, including a hotline and GoFundMe page for donations. Watch the full briefing here. Source

Investigators are trying to determine a motive in the largest mass shooting in modern U.S. history. CBS News correspondent John Blackstone joins CBSN from Las Vegas to describe the scene on the ground and how the city is recovering so far. Source

House Speaker Paul Ryan, R-Wisconsin, discusses the changes the Republican Party hopes to make with tax reform. Source

House Speaker Paul Ryan, R-Wisconsin discusses the objectives of the Republican tax plan. Source