Michigan state legislature closes offices due to 'credible threats of violence'

While Trump waits to hear whether the Supreme Court will take up Texas' case seeking to overturn and invalidate the votes of millions of Americans in four battleground states, he's continuing his pressure campaign on the high court Friday morning, calling on justices to “do what everybody knows has to do be done.”

Experts say justices are unlikely to take up the case, but the Texas lawsuit has quickly become a loyalty test for Republicans with 106 representatives -- about one-fourth of the House or half of the Republican caucus -- asking the high court to disregard millions of votes in a democratic election.

Trump also voiced his resistance Friday morning to turning over distribution of coronavirus vaccines to the incoming Biden administration, tweeting "they want to come in and take over one of the ‘greatest and fastest medical miracles in modern day history'" and slamming the Federal Drug Administration as a "big, old, slow, turtle" moments after Health and Human Services Secretary Alex Azar told ABC's "Good Morning America" that emergency authorization use of Pfizer's coronavirus vaccine is imminent and vaccinations could start as early as Monday. Trump's tweet follows months of him pressuring the agency to speed up its process for approving vaccinations.

Meanwhile, as the Biden White House takes shape, the president-elect is turning to familiar faces in former Obama administration officials to fill top posts and will be introducing some of those picks from Wilmington, Delaware, Friday afternoon.

His latest additions include tapping Dennis McDonough, former President Barack Obama’s chief of staff, as his nominee for secretary of veterans affairs, and naming Susan Rice, Obama’s former national security adviser, as the director of his White House Domestic Policy Council. These picks have some Democrats worried that with the resurgence of so many Obama-era officials there's little room for rising stars in the party.

In another historic first for the Biden team, the president-elect and Vice-President-elect Kamala Harris were named as Time’s 2020 "Person of the Year" -- the first time a vice president has been given the title.

Four states sued by Texas in a bid to overturn the results of the 2020 presidential election have asked the U.S. Supreme Court to swiftly reject the case and avoid legitimizing "a cacophony of bogus claims" that would upend the will of millions of American voters. 

In court filings Thursday afternoon, the attorneys general of Pennsylvania, Wisconsin, Michigan and Georgia were scathing in their rebuttal to Texas' suit. 

"The Court should not abide this seditious abuse of the judicial process," said Pennsylvania Attorney General Josh Shapiro told the justices in a court filing for his state.

-ABC News' Devin Dwyer

Dr. Jill Biden and retired Gen. Lloyd Austin, President-elect Joe Biden's choice for defense secretary, participated in a care package packing event in Washington D.C. hosted by Operation Gratitude, a nonprofit that sends care packages to members of the military, first responders and their families. 

The event marks the last day of box packing in D.C. as part of a multi-day effort in Washington and Los Angeles. Inside the boxes are handwritten letters from volunteers, snacks, hygiene items, handmade items like scarves and bracelets, playing cards and beanie babies.

Biden shared her message for the American people during the holiday season and talked about how her family's holiday plans would be different because of the pandemic. 

"I think it's changed every Americans' holiday plans," she said. "You know, families can't be together like they have."

"If all Americans would commit to an act of kindness toward a military family, and, of course so many people are food insecure during this time," she added.

Later, the first lady-elect, Austin and his wife took a photo with the volunteers from Operation Gratitude during which Biden said she was happy to have the Austin's join the Biden family. 

"We're so happy to welcome the general to our administration, and we're so proud to have both of them in -- joining the Biden family. So, thank you." she said.

"Great family," Austin added. "Some familiar faces in the crowd. Thank you for all you're doing. God bless you, God bless your families."

-ABC News' Beatrice Peterson and Lauren Lantry

Doug Emhoff, the husband of Vice President-elect Kamala Harris, will serve as a Distinguished Visitor from Practice at Georgetown University Law Center, according to a spokesperson for the transition.  

Emhoff, an attorney with nearly 30 years of litigation experience, will also serve as a Distinguished Fellow of the Georgetown Law Institute for Technology Law and Policy, drawing on his expertise in entertainment and media law. He is slated to teach one two-credit course in the spring semester entitled, “Entertainment Law Disputes.” 

“I’ve long wanted to teach and serve the next generation of young lawyers,” Emhoff said in a press release from Georgetown. “I couldn’t be more excited to join the Georgetown community.” 

The role at the university will be separate and apart from his official role as second gentleman. Emhoff will continue to work with the Biden-Harris transition team to develop the portfolio he will focus on during the upcoming administration.

Emhoff severed ties with his law firm DLA Piper in November. Dr. Jill Biden, one of his predecessors, taught community college students when President-elect Joe Biden served as vice president.

-ABC News' Averi Harper