CBS News went inside a facility housing the youngest unaccompanied migrant children, who showed up by themselves at the border or were separated from relatives. Thousands being held in shelters in 23 states could be held long-term. Manuel Bojorquez reports. Source

A number of Puerto Rico officials have stepped down as protests intensify demanding Gov. Ricardo Rosselló resign. “CBS This Morning” lead national correspondent David Begnaud joins “Red & Blue” with an update on the 11 days of protests. Source

Robert Mueller will soon be answering questions for the first time about the Russia investigation and his decision not to recommend criminal charges against President Trump. Both Democrats and Republicans are preparing for his testimony. Nancy Cordes reports. Source

The U.S. destroyed an Iranian drone last week over the Strait of Hormuz. CBS News has learned a Navy ship may have brought down more than one. David Martin is traveling in the Middle East with the head of U.S. Central Command and has the latest. Source

Nearly 18 years after 9/11, the Senate passed a bill guaranteeing financial support to the families of first responders. The bill now heads to the president’s desk. Chip Reid reports. Source

With Robert Mueller testifying on Capitol Hill on Wednesday, here are the most important takeaways from Mueller’s report — in his own words Source

Twenty Democratic presidential candidates will face off next week in Detroit for the second primary debates. The Washington Post’s Dan Balz joins CBSN’s “Red & Blue” to discuss why every candidate has something to prove. Source

“The fact that so many things were verified but nothing was done, Congress is almost like a dog without teeth” Source

It will be the first time Mueller will answer questions about the Russia investigation Source

An internal report of the New York City Housing Authority reveals the increased number of children suffering from lead poisoning and other dangers of living in the city’s public housing. Greg B. Smith, a reporter at The City, joins CBSN to discuss the findings. Source