What you need to know today about the virus outbreak

President Donald Trump is raising the idea of what he's calling a quarantine involving New York and parts of New Jersey and Connecticut, states hard-hit by the coronavirus pandemic. But there are questions as to whether the federal government has the power to do so.

The United States has more confirmed coronavirus infections than any other country. Cities including Detroit, Chicago and New Orleans are growing as hotspots of infection, while New York City continues to be pummeled. Nurses there are calling for more masks and other gear to safeguard themselves against the virus that has so far sickened more than 52,000 people and killed over 700 in New York state, mostly in the city. Italy's death toll from the coronavirus pandemic is the highest in the world, with 10,000 fatalities.

Here are some of AP's top stories Saturday on the world's coronavirus pandemic. Follow APNews.com/VirusOutbreak for updates through the day and APNews.com/UnderstandingtheOutbreak for stories explaining some of its complexities.

WHAT'S HAPPENING TODAY:

— New York Gov. Andrew Cuomohas delayed the state's presidential primary from April to June to keep people from gathering during the coronavirus pandemic. More than a dozen states have delayed some elections, in some cases including their presidential primaries.

— Canadian Prime Minister Justin Trudeau says anyone showing symptoms of COVID-19 will not be allowed to board domestic flights or intercity trains. The requirement will go into effect Monday.

— Census workers in the U.S. have to take a different approach to collecting information. Nonprofits and civic organizations leading census outreach efforts are pivoting to digital strategies.

— Brazil's presiden t is being sharply criticized for downplaying the pandemic, even suggesting Brazilians have a natural immunity to the...