The chairs of the House committees leading the impeachment inquiry subpoenaed two officials of the White House Office of Management and Budget: acting director Russell Vought and Michael Duffey, who oversees national security programs.

They also subpoenaed State Department counselor T. Ulrich Brechbuhl.

Investigators asked all three earlier this month to testify, but none have appeared.[snip]

Brechbuhl is said to have been the source of a mysterious packet of materials that House investigators were given. Rep. Jamie Raskin, D-Md., has said the package contained information from debunked conspiracy theories about Ukraine’s role in the 2016 election. The significance of the packet is unclear.[snip]

The committees want Duffey to appear on Nov. 5, and Vought and Brechbuhl the following day.