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.

The Biden transition team is pushing back on Acting Secretary of Defense Chris Miller's statement earlier Friday that there was a "mutually agreed upon holiday break" between the Pentagon and Biden officials, stressing the Biden team felt it was important to keep conversations going over the holiday.

Miller had denied reporting earlier in the day that there had been a halt to transition meetings with the Biden team, saying, "After the mutually-agreed upon holiday pause, which begins tomorrow, we will continue with the transition and rescheduled meetings from today."

However, the Biden transition disputed Miller's claim on a call briefing reporters Friday afternoon.

"Let me be clear: There was no mutually agreed upon holiday break. In fact, we think it's important that briefings and other engagements continue during this period, as there's no time to spare, and that's particularly true in the aftermath of the ascertainment delay," said transition official Yohannes Abraham.

Abraham added it was the team's expectation that meetings would continue "immediately."

Biden's team did not answer when asked if Miller was lying in his statement, instead saying the press could make its own judgments based on the information provided.

-ABC News' Molly Nagle and Luis Martinez