Walsh was a close ally of White House chief of staff Reince Priebus, serving as his chief of staff when Priebus led the Republican National Committee.
A White House official who insisted on anonymity to discuss a personnel move said Walsh had accepted a position with an outside organization but declined to identify the group.
Former National Security Adviser Michael Flynn resigned in February after Trump concluded Flynn had given misleading information about contacts with Russian officials.
Politico first reported Walsh’s planned departure.
/The Bloomberg/
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