The House Intelligence Committee has asked one of the top contractors to President Trump’s inaugural to provide it with documents about the event, a person familiar with the situation said on Wednesday, opening up a new line of inquiry into the planning and financing of the ceremonies.

The committee asked for documents from and an interview with Stephanie Winston Wolkoff, who had been a close friend of the first lady, Melania Trump, and who had helped plan the celebrations and parties around the inaugural, the person said. The request was disclosed by a lawyer for Ms. Winston Wolkoff in a letter this week to the inaugural committee.

It is unclear what was requested, or why the intelligence committee is now involved. But it adds a new layer to the existing federal investigations into the inaugural committee, which was run by Thomas J. Barrack, a close friend of the president, with help from some former Trump political aides. They include Rick Gates, who previously pleaded guilty to charges brought by the special counsel, Robert S. Mueller III, and who has been cooperating with various investigations for more than a year.

In February, federal prosecutors issued a subpoena to the inaugural committee demanding that it turn over documents about donors, finances and activities. The subpoena sought documents related to all of the committee’s donors and guests; any benefits handed out, including tickets and photo opportunities with the president; federal disclosure filings; vendors and contracts.