The five-time Grand Slam champion said she was notified by the International Tennis Federation several days ago that she tested positive for meldonium.
Democrats Hillary Clinton and Bernie Sanders have campaigned heavily in Flint, Michigan, as the city has dealt with a water poisoning crisis. The state's primary is on Tuesday.
Overcrowding is one of the biggest challenges facing the National Park Service, and as the agency prepares to turn 100, another record-breaking year is predicted.
Michigan's presidential primary is on Tuesday. Donald Trump looks to have strong support from the state's white working class voters, but John Kasich is campaigning hard there.
In New York City, transgender people are now guaranteed the right to use whatever single-sex restrooms and locker rooms they identify with in city-owned buildings. New York's mayor signed the executive order Monday amidst a national debate over gender identity and access to single-sex facilities.
With nominating contests in four more states on Tuesday, Ted Cruz is hoping to emerge as the one viable challenger to Donald Trump for the Republican nomination for president.
Fresh off a Super Bowl victory, Denver Broncos quarterback Peyton Manning announced he will retire after 18 seasons. Tennis star Maria Sharapova said Monday she failed a drug test.
FBI Director James Comey says encryption is making phones "warrant-proof," and it will allow criminal suspects to conceal evidence in a way that's unprecedented in American history. NPR checks on the validity of his claim.