Pet owners across the country are being warned about a potentially deadly toxic algae. Three dogs in North Carolina died last week after swimming in a pond that had blooms of blue-green algae. Anna Werner reports. Source

Greta Thunberg has been nominated for a Nobel Peace Prize and she is just 16 years old. She’s sailing from Europe to New York to call on world leaders to protect the planet. Roxana Saberi met her in her hometown of Stockholm, Sweden. Source

Secretary of State Mike Pompeo is calling on the international community to step up pressure on Iran, warning time is running out before a United Nations arms embargo on Tehran expires. Imtiaz Tyab is the only U.S. network correspondent to gain access to Iran’s territorial waters. Source

A look back at what we’ve been covering on “CBS This Morning.” Source

The Trump administration’s newest immigration policy will affect hundreds of thousands of legal immigrants. The “public charge” rule makes it more difficult for low-income immigrants to become permanent U.S. residents. The administration says it is only implementing a law that Congress passed 23 years ago. Weijia Jiang reports. Source

Congress is now investigating Jeffrey Epstein’s apparent suicide, with new reports raising questions about the federal jail where he was being held. Government investigators raided the alleged sex trafficker’s home in the Virgin Islands Monday. Mola Lenghi reports. Source

Army Sgt. Richard Stayskal alleges that military doctors knew about a tumor growing in his lung — but said nothing Source

Her husband was murdered in Honduras, and her 4-year-old son was almost kidnapped in Mexico. The U.S. still forced her to wait in one of Mexico’s most dangerous cities Source

Chinese security forces mass at border of semi-autonomous city in ominous display of power as Beijing calls protests an “existential threat” Source

At least 9 detail allegations to AP about the opera legend that span 3 decades and some say he retaliated if spurned; he says charges are “inaccurate” and “painful” Source