Attorney Sidney Powell was back at the White House Sunday to push President Donald Trump and his administration to issue an executive order to seize voting machines for examination, two sources with direct knowledge tell ABC News.

 It is unclear if Powell met face-to-face with the president Sunday.

She met with Trump in the Oval Office Friday night and was joined by Trump's former national security adviser, retired Lt. Gen. Michael Flynn.

Sources, who were against the move Friday evening, were stunned to hear Powell was back in the building Sunday.

Critics expressed alarm at Friday's meeting, which was first reported by The New York Times. Noah Bookbinder, who heads the watchdog group Citizens for Responsibility and Ethics in Washington, told ABC News that the ideas raised in the Oval Office would represent an "abuse of power" and were "wrong and must be condemned."

- ABC News' John Santucci, Katherine Faulders

Speaking Sunday on "This Week with George Stephanopoulos," former Michigan Gov. Jennifer Granholm, who was just announced as nominee for Energy Secretary in President-elect Biden's administration, said Biden had "robust"plans for addressing climate change and responding to the massive SolarWinds hack.

"The civil servants, the investigators, the scientists who are doing the investigation, they've got to be able to come up with very specific answers so we know what the response will be. But Joe Biden I know will have a robust response once we find out the perpetrator and extent of it," Granholm said about the cyberattack.

On Biden's plans to address climate change, Granholm said, "The Green New Deal was an important framework for what Joe Biden has put on tap, but I mean really, this is the most robust climate change plan ever."

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-Molly Nagle (edited)

Sen. Mark Warner, the top Democrat on the Senate Intelligence Committee, joined with Secretary of State Mike Pompeo and his Republican Intelligence Committee counterpart, Sen. Marco Rubio, on "This Week" Sunday in placing the blame for the government cyberattack on Russia, despite President Trump's downplaying of the country's involvement Saturday.

"I would echo what Secretary Pompeo has said and Marco Rubio has said. All indications point to Russia," Warner said. "This is extraordinarily serious, and when the president of the United States tries to deflect or is not willing to call out the adversary as we make that attribution, he is not making our country safer," he further said.

The senator also told George that the intrusion "may be ongoing" and that, despite current indications that only "non-classified networks" were breached, the attackers nevertheless got away with a "big, big haul" and that it could be some time before the government is able to fix the underlying vulnerabilities.

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- Adam Kelsey

Wrapping up Saturday's event announcing members of the incoming administration's climate and energy team, Vice President-elect Kamala Harris emphasized how forceful Biden's plan is in fighting climate change.

"Part of the reason I was so proud to join Joe Biden as his running mate was because he was proposing one of the most ambitious climate plans in history, a plan to secure carbon pollution-free electricity by 2035, a plan to achieve net-zero emissions no later than 2050, a plan to invest in a clean energy future and create millions of good-paying union jobs along the way," she said.

"And the team that President-elect Biden and I are announcing today will help make that plan a reality," Harris added.

The vice president-elect said the appointees and nominees announced Saturday represented some of the country's "most seasoned public servants and climate experts" and reflected the "very best of America."

"They are compassionate leaders who understand that, ultimately, addressing climate change is about building safer communities and healthier communities and thriving communities for all Americans," Harris said.

While Trump, once again, has no public appearances on his schedule for Thursday, his vice president is assuming the spotlight.

Ahead of being scheduled to receive the coronavirus vaccine publicly Friday, Vice President Mike Pence returns to Georgia on Thursday to stump for Republican Sens. Kelly Loeffler and David Perdue who are locked in runoff elections that will determine which party controls the U.S. Senate -- and Biden’s subsequent ability to pass the big ticket legislation he campaigned on.

The sitting Georgia senators face Democratic challengers Jon Ossoff and Raphael Warnock for the Jan. 5 races, and early voting kicked off in the state this week. Warnock is appearing on ABC’s “The View” at 11 a.m. to discuss his candidacy. 

Vice President-elect Kamala Harrisand Biden, fresh off his own visit to Georgia to stump for those Democrats, are meeting with transition advisers Thursday as they prepare to unveil more Cabinet picks ahead of Christmas. The president-elect is expected to receive the coronavirus vaccine himself as soon as next week.

It's unclear when Trump will receive the vaccine. White House Press Secretary Kayleigh McEnany said Tuesday the president is "absolutely open" to taking it but is still protected by his Regeneron -- an antibody cocktail from his COVID-19 bout in October. She also said Trump is not taking it yet to "set an example" that health care workers and long-term care facility residents should get it first. 

On Capitol Hill, negotiations for another COVID-19 relief package continue ahead of lawmakers also facing a government spending deadline on Friday in order to avoid a shutdown. The $908 billion COVID-19 relief package is expected to include $300 per week in expanded federal unemployment benefits through March and a one-time check of $600 for millions of Americans below a certain income level. It would come as at least 20.6 million Americans head into the holidays unemployed.