Scarcely a day goes by that Gov. Ron DeSantis isn't holding a news conference somewhere in Florida, talking about his policy of providing the COVID-19 vaccine to "seniors first." The state now leads the nation in vaccinating senior citizens. In a state with 4.5 million people 65 and over, that's good news. The bad news is that in Florida, as elsewhere, the demand far exceeds the supply of vaccine, creating a first-come-first-served process that has left some groups out.

A number of European countries have announced new mask recommendations and requirements, pushing aside fabric masks in favor of surgical masks or medical-grade respirators.

A review of data from K-12 schools that reopened for in-person instruction in the fall has found little evidence that schools contributed meaningfully to the spread of COVID-19, according to a new article published Tuesday in JAMA, the journal of the American Medical Association.

California lifted stay-at-home orders for all regions on Monday as the government said hospital intensive care unit capacity is expected to increase.

The stay-at-home orders applied to regions of the state where availability in ICUs had dropped below 15%. Southern California, the Bay Area and the San Joaquin Valley were still under the order when it was lifted.

The Transportation Security Administration caught approximately 10 firearms per million passengers passing through U.S. airport security in 2020 — twice the 2019 rate — amid the sharp drop in air travel because of the coronavirus.

Updated 5:40 p.m. ET

After senators were sworn in Tuesday afternoon as jurors in the impeachment trial of former President Donald Trump, Sen. Rand Paul quickly pressed for a vote to force lawmakers on the record over the issue of the trial's constitutionality.

The Senate voted 55-45 to reject the Kentucky Republican's argument that the impeachment trial is unconstitutional because Trump is no longer in office.

Updated at 5:46 p.m. ET

President Biden announced Tuesday that his administration is working to purchase an additional 200 million doses of the two COVID-19 vaccines that have been authorized for emergency use, with the goal, the White House says, of having enough vaccine supply for the entire adult U.S. population by the end of the summer.

He also announced steps to increase vaccine doses going to state and local governments over the next three weeks, and to provide them more clarity going forward about how much supply they should expect.