“In the course of my duties, I have received information from multiple U.S. government officials that the President of the United States is using the power of his office to solicit interference from a foreign country in the 2020 U.S. election,” the declassified complaint states.

The complaint also states that senior White House officials tried to “lock down” records of Mr. Trump's call with the president of Ukraine, especially the word-for-word transcript. Nancy Pelosi said the administration’s reported efforts to conceal the call amounted to a “cover-up.”

Read the full complaint here. And we put together a broader list of takeaways.

Who is the whistle-blower? Three people familiar with his identity told The Times that he is a C.I.A. officer who was detailed to work at the White House on the National Security Council and has now returned to the C.I.A. Little else is known about him.

Crucial testimony: The acting director of national intelligence, Joseph Maguire, testified before a House committee on Thursday. “I think the whistle-blower did the right thing,” he said. “I think he followed the law.”

Mr. Maguire faced repeated questions from Democrats about his decision to consult with the White House and Department of Justice — especially since the president and attorney general were the subjects of the complaint — before bringing the matter to Congress. He responded that he acted as he did because the situation was “totally unprecedented .”