The answers remain central to the probe's credibility.
The cause of the Oct. 6 crash was still being investigated by federal authorities.
Jamal Khashoggi disappeared on Oct. 2 after visiting the Saudi consulate in Istanbul.
Ashraf Al Safoo aided ISIS in recruiting and encouraging others to carry out terrorist attacks, according to federal prosecutors.
Gov. Walker's spokesman said the incident that led to his running mate's resignation happened Sunday. Walker said he learned of it Monday.