George W. Bush's administration claimed immunity for two White House officials, chief of staff Josh Bolten and White House Counsel Harriet Miers, during the investigation into the abrupt firing of nine US attorneys.
A judge ultimately ruled the White House could not claim immunity, and Bolten handed over documents and Miers testified.
Nathan also noted that Letter is simultaneously juggling these court fights while advising various House committees on the impeachment inquiry.
He knows how difficult getting information from the White House, its current and former employees, or private citizens can be.
It's a difficult situation when the White House is being so obstructionist across the board.