The House Intelligence Committee is seeking an interview with and documents from a top organizer on President Trump’s inaugural committee, according to people familiar with the request, signaling that Congress is expanding its probe of how the fund raised and spent more than $100 million.

The March 19 request from the House Intelligence Committee was disclosed in a letter sent to a lawyer for the inaugural committee this week by an attorney for Stephanie Winston Wolkoff, a former adviser to first lady Melania Trump who served...