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Trump walks to the Oval Office on Sept. 20. Photo: Saul Loeb/AFP/Getty Images

Trump’s reported request for Ukraine to investigate former Vice President Joe Biden is part of a secret whistleblower complaint over an alleged "promise" made between the president and an unnamed foreign leader, the New York Times reports.

The big picture: Many details about the whistleblower report, "submitted by a member of the intelligence community," per the Times, are still unknown. The Trump administration "has not shared the complaint with Congress, as is generally required by law," the Times reports.

Background: Biden called for Trump to release a transcript of his July phone call with Ukrainian President Volodymyr Zelensky on Friday, amid reports that Ukraine is at the center of a whistleblower's complaint over Trump's contacts with a foreign leader.

  • Last month, Trump's personal lawyer Rudy Giuliani held an in-person meeting in Madrid with one of Zelensky's top representatives to encourage Ukraine to investigate potential conflicts of interest involving the Biden family, the NYT reports.

Go deeper: Trump's defiance on Ukraine

Go deeper

Kamala Harris resigns from Senate seat ahead of inauguration

Vice President-elect Kamala Harris. Photo: Mason Trinca/Getty Images

Vice President-elect Kamala Harris submitted her resignation from her seat in the U.S. Senate on Monday, two days before she will be sworn into her new role.

What's next: California Gov. Gavin Newsom has selected California Secretary of State Alex Padilla to serve out the rest of Harris' term, which ends in 2022.

2 hours ago - World

Putin foe Navalny to be detained for 30 days after returning to Moscow

Russian opposition leader Alexey Navalny. Photo: Oleg Nikishin/Epsilon/Getty Images

Russian opposition leader Alexey Navalny has been ordered to remain in pre-trial detention for 30 days, following his arrest upon returning to Russia on Sunday for the first time since a failed assassination attempt last year.

Why it matters: The detention of Navalny, an anti-corruption activist and the most prominent domestic critic of Russian President Vladimir Putin, has already set off a chorus of condemnations from leaders in Europe and the U.S.

Biden picks Warren allies to lead SEC, CFPB

Photo: Justin Sullivan/Getty Images

President-elect Joe Biden has selected FTC commissioner Rohit Chopra to be the next director of the Consumer Financial Protection Bureau (CFPB) and Obama-era Wall Street regulator Gary Gensler to lead the Securities and Exchange Commission (SEC).

Why it matters: Both picks are progressive allies of Sen. Elizabeth Warren (D-Mass.) and viewed as likely to take aggressive steps to regulate big business.