They sought all of them, but the WH / administration ordered them not to appear.
Impeachment.
politico.com/news/2020/01/0…
Arguments were made on Jan. 3, and ruling could come any day.
politico.com/news/2020/01/0…
"It is why we have courts," he says ,of dispute between Congress and WH.
DOJ has argued that courts should NOT step into dispute between two branches because it would politicize them.