White House chief of staff John Kelly sent a memo to top government officials on Friday approving changes to how the Trump administration oversees background investigations and grants security clearances, a move largely seen as a response to concerns that emerged following the resignation of Rob Porter last week.

Writing to FBI Director Christopher Wray, Attorney General Jeff Sessions, Director of National Intelligence Dan Coats, and two top White House aides, Kelly said the Porter scandal proved, “We should — and in the future, must — do better” at vetting applicants for positions inside the administration.