The Kentucky Republican has become the first U.S. senator to test positive for the coronavirus.

The coronavirus is scrambling so much of our lives at the moment, there's no surprise it's doing the same to the presidential race.

Former Vice President Joe Biden vowed that, if elected, his administration would "lead by science." Sen. Bernie Sanders urged President Trump to declare a national emergency.

The 38-year-old rose from being mayor of a midsize Indiana city to mounting a serious Democratic presidential run. He was the first openly gay candidate to win delegates in a presidential race.

The announcement comes two days after Mike Bloomberg faced tough questions about the issue in a Democratic debate.

He jumped into the Democratic presidential primary months after most of his competitors did and never gained traction in polls.

The top target is Pete Buttigieg. He faced a barrage of attacks as the other Democratic candidates seek to blunt his momentum from a strong showing in Iowa.

The 45-year-old tech entrepreneur is the seventh candidate to qualify for the Feb. 7 debate in Manchester, N.H., which is just four days ahead of the primary there.

Just six of the remaining 12 Democratic candidates qualified for Tuesday night's debate, making it the smallest debate stage yet.

The former secretary of housing and urban development and former San Antonio mayor was among the first to advocate for decriminalizing illegal border crossings. Other candidates followed his lead.