Trump-Biden transition: Attorney Sidney Powell back at White House Sunday

Powell has pushed Trump to issue an executive order to seize voting machines.

President Donald Trump is slated to hand over control of the White House to President-elect Joe Biden in 31 days.

Attorney Sidney Powell back at White House Sunday

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

Jennifer Granholm talks Biden administration's 'robust' plans for climate change, response to cyberattack

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)

Cyber hack resulted in 'big haul' and is 'ongoing': Sen. Mark Warner

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

Biden administration proposing one of the most ‘ambitious climate plans in history’: Harris

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.

Gina McCarthy accepts nomination for first-ever national climate adviser

Former E.P.A. chief Gina McCarthy accepted her nomination as the first-ever national climate advisor to head the new White House Office of Domestic Climate Policy.

"I'm here today because climate change is not only a threat to the planet. It is a threat to our health and our well-being," McCarthy said. "It's a threat to people everywhere and the precious natural resources that we depend on."

Defeating this threat, she went on, "will require engagement of every community, every sector in our nation and every country in the world."

In the role, she said she will work directly with communities and harness "the force of science and the values of environmental justice."

Biden referred to McCarthy, who currently serves as president and CEO of the Natural Resources Defense Council, as a "policy wonk and a people person, problem solver and coalition builder."

While E.P.A. head under the Obama-Biden administration, she led the effort of lowering carbon emissions from power plants and conserving critical water sources, he said.

McCarthy will work closely with former Secretary of State John Kerry in the new role, Biden said.