Some people are skeptical on the legitimacy of what some are calling “emergency” security clearances given by executive order[1] but there’s no evidence this is not within the bounds of the president’s power. An expedited clearance could have been granted in 48 hours but presumably the backlog has already lasted longer than that and would hamper plans for the first month in office.
[1] https://www.whitehouse.gov/presidential-actions/2025/01/memo...