Former Oklahoma Sen. Tom Coburn, whose inflexible support of conservative policies placed him at the heart of many major congressional battles, has died at the age of 72. His former communications director, John Hart, confirmed that Coburn died Saturday morning "after a long battle with prostate cancer."

Coburn's former colleague, fellow Republican Sen. James Lankford of Oklahoma, remembered the senator as a "friend and a leader."

As coronavirus infections rise across the United States, public health experts widely agree it's time for a drastic step: Every state in the nation should now issue the kind of stay-at-home orders first adopted by the hardest-hit places. And while most states will probably not need to keep the rules in place for months upon months, many health specialists say the lockdowns will need to be kept up for several weeks.

Yet among these same experts, there is debate when it comes to the natural next question: What strategy can be deployed after the lockdowns are lifted?

U.K. Prime Minister Boris Johnson has tested positive for the coronavirus that causes COVID-19, he announced Friday. In a video announcement, Johnson said he has "mild symptoms" of COVID-19, including a fever and "a persistent cough."

Johnson is the first world leader found to be infected with the coronavirus. German Chancellor Angela Merkel is under self-quarantine after her doctor tested positive for the virus. She has undergone two tests that yielded negative results; a third test is scheduled for early next week.