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Sheryl Sandberg and her fiancé, Tom Bernthal, arrive Tuesday for the Allen & Co. Sun Valley Conference in Idaho. Photo: Kevin Dietsch/Getty Images

The close relationship between Facebook CEO Mark Zuckerberg and COO Sheryl Sandberg was strained by the Trump era, the N.Y. Times' Sheera Frenkel and Cecilia Kang write in their book, "An Ugly Truth: Inside Facebook’s Battle for Domination," out Tuesday.

  • "She became increasingly isolated," they write in an adaptation posted by The Times Thursday. "Her role as the C.E.O.'s second-in-command was less certain with his elevation of several other executives, and with her diminishing influence in Washington."

"The view from inside the upper echelons of the company was clear: It felt as though Facebook was no longer led by a No. 1 and No. 2, but a No. 1 and many," the book reports, drawing on 400+ interviews.

  • "It is true that the core of the partnership hasn’t formally changed. Mr. Zuckerberg controls the direction of the company and Ms. Sandberg the ad business, which continues to soar unabated."

Facebook spokesperson Dani Lever replied in a statement to Axios: "The fault lines that the authors depict between Mark and Sheryl and the people who work with them do not exist. All of Mark’s direct reports work closely with Sheryl and hers with Mark. Sheryl’s role at the company has not changed."

  • "The excerpts are typical of attacks on women leaders — denying their power, dismissing their competence, and marginalizing their roles and relationships."

Keep reading the adaptation (subscription).

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Go deeper

4 takeaways from the Facebook whistleblower hearing

Facebook whistleblower Frances Haugen appears before a Senate subcommittee on Oct. 5 in Washington, D.C. Photo: Matt McClain-Pool/Getty Images

Whistleblower Frances Haugen on Tuesday provided rare insight into Facebook's operations during her testimony before the Senate Commerce Subcommittee on Consumer Protection.

What you need to know: The former Facebook product manager sought to expose the social media giant's knowledge of harmful content circulating on its platform and underscored the company's lack of transparency — sparking outrage from both Democrats and Republicans on the committee.

Texas abortion law remains in effect after appeals court ruling

Pro- and anti-abortion protesters outside the Supreme Court as arguments begin about the Texas abortion law on Capitol Hill in November. Photo: Jabin Botsford/The Washington Post via Getty Images

A U.S. appeals court transferred a challenge to Texas' law banning most abortions after about six weeks of pregnancy to the state supreme court in a 2-1 vote on Monday evening.

Why it matters: The 5th U.S. Circuit Court of Appeals' decision means the country's most restrictive abortion law can remain in place for the time being.

2 hours ago - World

At least 2 dead after Tonga volcano eruption and tsunami

A satellite image of the explosive eruption of the Hunga Tonga-Hunga Ha'apai volcano on Saturday. Photo: UNICEF/NOAA

At least two people are confirmed to have died in Tonga following the undersea volcanic eruption that sent tsunami waves toward the island nation and across the Pacific over the weekend, officials said Monday.

The big picture: Officials reported major damage along the western coast of the main island of Tongatapu, where the capital, Nuku'alofa, was covered in ash and dust, including on the runway of the airport. A New Zealand Ministry of Foreign Affairs spokesperson told Axios over the phone that two people had been confirmed to have died in the disaster.