There are calls to re-start Syrian peace talks after opposition leaders asked for a timeout. Increased fighting in Syria in recent days indicates a possible crumbling of the partial cease-fire, brokered by the United States and Russia in February. President Obama and Russian President Vladimir Putin spoke on the phone Monday about the crisis. “CBS This Morning” co-host Charlie Rose interviewed the president at the White House, just after the call. Source

Candidates Hillary Clinton and Donald Trump are favored to win the New York primary Tuesday. Bloomberg Politics managing editor John Heilemann joins “CBS This Morning” to discuss what to expect in the key primary and its impact on the 2016 presidential race. Source

Houston, the country’s fourth largest city, is struggling to cope with widespread flooding triggered by historic rainfall. Five people died Monday, and more water rescues are underway even as floodwaters recede. More wet weather is in the forecast. Omar Villafranca reports from Houston where people are racing to escape rushing water. Source

Several others were wounded. Police say it appears the gunman took his own life. Source

Beloved Emmy-winning actress Doris Roberts from “Everybody Loves Raymond” dies at age 90. CBSN’s Elaine Quijano has more. Source

Donald Trump charges his opponents of trying to steal the nomination. That was also the charge at the Republican convention of 1952. Eisenhower’s forces chanted in Chicago that summer, “thou Shalt Not Steal!” The accused thief: Sen. Robert Taft. Throughout 2016’s unorthodox campaign cycle, history still finds a way of repeating itself. Source

Clarence Page of the Chicago Tribune, Amy Davidson of the New Yorker, Ron Fournier of the National Journal, and USA Today’s Susan Page join John Dickerson in breaking down the “political evolution” of the candidate nomination process. With Donald Trump leading the delegate count, will Republicans try to recruit House Speaker Paul Ryan? Source

Democratic Strategist David Axelrod says Bernie Sanders will not win the support of superdelegates if Hillary Clinton continues to win the majority of votes, but commends the Vermont senator for influencing his opponent’s platform. Source

An earthquake measuring 7.8 magnitude rocked Ecuador’s central coast late Saturday. At least 77 were killed and hundreds injured outside Quito. The Ecuador quake is being described by one expert as 6 times stronger than the back to back earthquakes that hit half a world away in Japan late last week. In Kumamoto, rescue efforts continue following the two quakes that killed at least 41 people and injured more than 1500. Source

With fears mounting over the Zika virus’ growing proximity to the United States, Dr. Anthony Fauci separates fact from fiction. The director of Allergy and Infectious Diseases at the National Institutes of Health breaks down America’s stateside mission to prevent the spread of the virus. Source