ABC News Prime: America's deadliest day; US citizen vaccinated in UK; Rolling out vaccine on an app.

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Inauguration Day, Migrant clash, Dino Selfie: The Week in Photos.

Inauguration Day, Migrant clash, Dino Selfie: The Week in Photos.

A look at the top photos from around the globe.

ABC News Live Update: House to send Trump impeachment article to Senate on Monday.

ABC News Live Update: House to send Trump impeachment article to Senate on Monday.

The Senate trial must begin the following day, according to the Constitution, plus, how to protect yourself against more contagious COVID-19 variants.

Coronavirus crisis: speeding up vaccine rollout as virus mutates.

Coronavirus crisis: speeding up vaccine rollout as virus mutates.

Dr. Fauci warns new COVID-19 variants could cause a surge in cases, ABC's Dr. John Brownstein discusses whether people should start double masking, plus, more on the vaccine shortage in U.S. cities.

Senate could vote and confirm Janet Yellen as treasury secretary today.

Senate could vote and confirm Janet Yellen as treasury secretary today.

What to expect from President Joe Biden's treasury pick, plus, Biden is expected to to sign new executive orders designated to help fight U.S. hunger and increase rights for federal workers.

Mystery Powerball winner

Mystery Powerball winner

Someone in a small town in Maryland is holding the $731 million winning ticket. ABC’s Andrea Fujii reports. SUBSCRIBE to ABC NEWS: Watch More on LIKE ABC News on FACEBOOK FOLLOW ABC News on TWITTER: GOOD MORNING AMERICA'S HOMEPAGE: #ABCNews #Power...