Chief of Staff John Kelly was apparently among those who were considering promoting Porter. CNN said though that Kelly was aware that Porter's ex-wifes had damaging information on the staff secretary.
Porter has since been accused by Colbie Holderness and Jennifer Willoughby of physical and verbal abuse while they were each married to Porter, CNBC reported.
The FBI had been doing a security background check on Porter and gave a partial report to the White House in March, with the complete report submitted in July. The White House asked for a follow-up information in November, USAToday reported. The bureau "closed the file" on Porter in January, according to the newspaper.
The White House said last week that Porter was still under his background investigation when he resigned and that he was working under a temporary security clearance because of a background check delay, CNBC reported.