Senior White House officials knew about allegations of domestic violence against a top aide for a year before he was forced to quit this week, it has been claimed.
Trump's son-in-law and dozens of other White House staffers, some now being investigated in the Russian Federation probe, don't have permanent security clearance.
Another aide for President Trump has declared his decision to step down with domestic abuse accusations emerging.
But there are growing questions about how Mr Porter managed to maintain a position of high influence despite the allegations.
The White House "should be able to focus on continuing President Trump's historic accomplishments for the American People", he texted to the Post. "But when the staff draws scrutiny to him, he does not appreciate that", said one of the sources, speaking on condition of anonymity.
"I think he could have been more explicit about the victims of domestic abuse and how domestic violence is never okay", Cortes said.
At Thursday's press briefing, The White House tried to clarify.
There is a sense that the Porter situation may finally push Trump to move against Kelly, according to several Republicans close to the White House. And the official stressed that the Federal Bureau of Investigation had at no point revoked Porter's interim security clearance.
Trump has also tapped former Deputy Chief of Staff Jim Carroll to serve as the next drug czar. That same day, it issued a statement from Kelly praising Porter. Porter at that time told Kelly he would leave the White House in December but agreed to stay at Kelly's urging, the Republican said on condition of anonymity. Porter had been staff secretary to Donald Trump.
The FBI had this information has they conducted the background search on Sorensen, according to his ex-wife Jessica Corbett, who says she spoke with the FBI about Sorensen's violence last fall.
Hicks had been dating Porter and was one of the officials behind initial White House statements supporting him.
"We immediately confronted the staffer, he denied the allegations and he resigned today", Shah told the Associated Press.
Trump paid tribute to him, saying: "We found out about it recently and I was surprised by it, but we certainly wish him well and it's a tough time for him". "His pathetic defense of staff secretary Rob Porter reveals his true nature-an enabler of sexual abusers, a betrayer of trust and an avoider of responsibility", the organization said.
The White House has refused to detail which aides knew about the alleged abuse, saying only that the full scope of the claims wasn't known until Wednesday morning, when photographs of the bruised face of one of Porter's ex-wives were published online.