Trump announces new impeachment legal team

Marking one week as president, Biden will turn his attention to the climate crisis with a suite of new executive actions Wednesday.

The president, who has already revoked a permit for the controversial Keystone XL pipeline project and moved to reinstate the country to the Paris Agreement, will deliver remarks and sign executive actions on tackling climate change, creating jobs and restoring scientific integrity in the White House State Dining Room on Tuesday afternoon.

White House press secretary Jen Psaki will also hold a press briefing with Biden's climate envoy, former Secretary of State John Kerry, and Biden's national climate adviser, Gina McCarthy.

-ABC News' Sarah Kolinovsky

Sen. Patrick Leahy, D-Vt., has been released from the hospital Tuesday night after being taken "out of an abundance of caution" earlier in the day. The 80-year-old was taken to a local hospital after he told staffers at the Capitol he was feeling sick, a spokesperson said Tuesday evening.

Leahy is currently the most senior Senate Democrat -- the "president pro tempore" -- and as such is presiding over Donald Trump's impeachment trial.

"The Capitol Physician suggested that Senator Leahy go to George Washington University Hospital this evening for observation, out of an abundance of caution," David Carle, spokesman for Leahy, said in a statement. "After getting test results back, and after a thorough examination, Senator Leahy now is home. He looks forward to getting back to work."

There was no mention of his symptoms, or whether he was tested for COVID-19.

Leahy has served in the Senate since 1975.

-ABC News' Trish Turner and Allie Pecorin

Antony Blinken has been officially sworn in as secretary of state by a senior career ambassador, Carol Perez, who is currently serving as acting Under Secretary for Management. 

He also has launched his official Twitter account -- @SecBlinken -- and tweeted some photos from the ceremony, which was closed to journalists.

-ABC News' Conor Finnegan

Biden, in afternoon remarks from the White House, announced that his administration has secured commitments from coronavirus vaccine makers to buy another 200 million doses to arrive this summer, raising the total to 600 million and ensuring the U.S. will eventually have two shots of the Pfizer and Moderna vaccines for nearly every American.

Biden also told the nation to expect a modest uptick in production in the near term -- from 8.6 million doses a week to a minimum of 10 million a week -- for the next three weeks.

"This is going to allow millions of more Americans to get vaccinated sooner than previously anticipated. We've got a long way to go, though," Biden said.

The announcement does not resolve the major shortages the nation is experiencing now, and does not suggest the Biden administration has found a novel way to ramp up production quickly.

One Biden administration official, who briefed reporters earlier on condition of anonymity, did not provide a firm timetable on the 200 million extra doses, pointing to the summer, but hailed the move as a guarantee that every American who wants a shot can get one.

Biden said it was enough to vaccinate 300 million Americans "by end of the summer, beginning of the fall."

-ABC News' Anne Flaherty