Chief of Staff Kelly makes changes to clearance process following domestic abuse scandal

Kelly acknowledged "we should -- and in the future, must -- do better."

Kelly acknowledged "we should -- and in the future, must -- do better," but he does not admit any personal wrongdoing.

In the memo, first reported by the Washington Post, Kelly says going forward the FBI should hand deliver to the White House its background investigations on individuals in senior positions and "verbally brief the White House counsel on any information in those files they deem to be significantly derogatory."

Kelly's memo comes in the wake of a White House scandal that called into question how security clearances are issued, and who in the White House is able to gain access to classified information without the proper clearance.

Kelly's memo says that future interim clearances must be granted a temporary clearance of 180 days, with an option to extend for an additional 90 days "if no significant derogatory information that would call into question whether interim status is appropriate."

It also says that individuals working under interim clearance status, as Porter did, would only be able to access highly classified information with "explicit Chief of Staff's approval, which would be granted only in the most compelling circumstances."

The memo implies Kelly had no prior knowledge of the seriousness of the claims against Porter, who was handling classified documents while working closely with Trump.

The White House came under fire for its response to Porter, and questions surrounding who knew what -- and when -- about Porter's health.

Vice President Mike Pence admitted on Wednesday that the White House "could have handled this better."

"This administration has no tolerance for domestic violence, nor should any American," Pence said.

The President has voiced frustration over the handling of domestic abuse allegations involving one of his closest aides, and even discussed possible replaces for Kelly, sources close to the president told ABC News.

"It is clear that new administrations will face similar challenges in the future and one of the most important things that a new White House staff must do correctly starting on Inauguration Day is to get the security clearance and suitability reviews processes right," wrote Kelly.

"We have a duty to the American people to ensure that, if nothing else, clearance and security protocols are passed down and become institutional knowledge of the White House."