(DAILY MAIL) — Rob Porter has resigned from his role as White House staff secretary after his first ex-wife told DailyMail.com that he choked and punched her during their marriage.

Colbie Holderness, 37, who is a senior analyst for the U.S. government, spoke on the record to DailyMail.com about her five-year marriage to Porter, detailing physical and mental abuse.

She said he broke down her confidence so badly with his verbal and emotional abuse that she took an extended leave of absence from grad school.

Note: Read our discussion guidelines before commenting.