Mr Porter's decision to resign - and the allegations against him - have shocked those who know him.
Two sources with knowledge of the situation tell CBS News the Federal Bureau of Investigation informed the White House in November about the domestic abuse allegations against Porter.
In a lengthy interview, Holdnerness, who married Porter in 2003, told CNN on Wednesday that the physical abuse began nearly immediately after their wedding. "I was let down by that", Holderness said. "I am praying for Rob and those involved". I know Rob. I've known him for years, both as a close friend and as a personal advisor.
Also Read: Sarah Sanders: If Trump's a Racist, 'Why Did NBC Give Him a Show for a Decade?' The Intercept also spoke with Trish Stack, a former co-worker, who said Holderness told her about the alleged abuse in 2004 and 2005, and another brother Spencer Paulson, who was told about the alleged abuse in 2006. "We were arguing and he punched me in the face", she said. Holderness provided photos of her facial injuries to the media.
"It's incredibly discouraging to see such a vile attack on such a decent man", Hatch said. "I took the photos given to the media almost 15 years ago, and the reality behind them is nowhere close to what is being described", Porter said in a statement.
Mr Porter said photos published of his former spouses were taken almost 15 years ago and did not tell the complete story.
"He's wrong in that the circumstances are exactly what I described".
CNN's took a moment during his Wednesday show to remind audiences that President was once again further eroding "basic lines of human decency". She later confirmed to the Daily Mail that it was about him.
Mr Porter's first wife, Colbie Holderness, told the Daily Mail that he choked and punched her during the five years they were husband and wife. During their honeymoon in Myrtle Beach, the bursts of anger that she had already become familiar with were "more intense", she said.More news: White House defends handling of Rob Porter allegations, amid criticism
More news: Eagles coach Doug Pederson enlisting Brett Favre for Super Bowl pep talk
More news: MN Rep Jason Lewis Injured in Train/Truck Crash
Willoughby, who married Porter in 2009, alleges that he violated their separation agreement in 2010 visiting her residence and punching a window. Willoughby then filed a temporary protective order.
This incident reportedly led to Willoughby not attending a vacation with Porter's family that holiday season.
His two ex-wives publicly accused him of domestic abuse. "I was afraid he would break in". "I'm sorry to bother you".
"When he heard me on the phone with the police", Willoughby wrote in the complaint, "he apologized and begged me not to involve them".
The woman now works in the federal government. Domestic violence in any form is abhorrent. Porter previously worked for Utah Republican Sen.
Rob Porter was a squeaky-clean aide who made sure that papers landing on the president's desk were in order.
Porter's role was under-the-radar, and Trump himself remained largely unfamiliar with him for weeks before his role was explained.
This isn't the first time that people close to the president have been accused of improprieties. According to Axios, senior Trump advisers, including Chief of Staff John Kelly urged Porter "to stay and fight".
The White House also distributed a statement from Hatch defending Porter.
At one event in the East Room, for example, Mr Porter stood in the back of the room and gestured to the president, showing him where he was supposed to go in order to sign documents.
But the White House press secretary refused to be drawn on that issue.