Some White House officials had opposed Mr. Orban’s visit, including the national security adviser John Bolton. The episode came up last week during testimony to impeachment investigators, whose inquiry is focused on Mr. Trump’s efforts to pressure Ukraine to look into his political rivals.

Related: House Democrats had hoped to hold an impeachment vote by Thanksgiving but are now planning to hold a series of hearings to sharpen their case, extending the process into December.

Explainer: Readers have asked why another country’s interference in a U.S. election is such a serious issue. Here are some answers.

Yesterday: Mr. Trump dismissed as “phony” the part of the Constitution that prohibits a president from profiting from a personal business while in office.