U.S. Secretary of State Marco Rubio issued a waiver on Tuesday for life-saving humanitarian assistance during a 90-day pause in foreign aid while Washington undertakes a review, according to a State Department memo seen by Reuters.

Secretary of State Marco Rubio backtracked on Trump’s near-total foreign aid freeze and approved potentially billions of dollars in “life-saving humanitarian assistance.” Many aid groups are still unsure what that means.

The extent of the impacts of the Trump administration’s sudden 90-day freeze of almost all foreign aid is still unclear almost a week on, as officials and aid workers overseas try to make sense of which activities must be suspended.