A White House aide has announced his resignation hours before his scheduled testimony and says he is willing to testify. @TerryMoran has the story. https://t.co/TsaygoXCVs pic.twitter.com/wzuc7UUmEE

— Good Morning America (@GMA) October 31, 2019

Attorneys representing President Donald Trump, the House of Representatives and Charles Kupperman, the president’s former deputy national security adviser, will appear in federal court Thursday in a case in which Kupperman is asking a judge the decide whether he must submit to questioning in the House impeachment inquiry.

The case is the latest twist in White House efforts to block all former and current administration officials from testifying or otherwise cooperating with the Democrat-led probe.