With the country’s vaccine rollout in utter disorder, health officials in the Biden administration are cautiously trying to both manage expectations and express optimism.

In a series of interviews over the weekend, officials warned that states could face vaccine shortages in the short term, with some states’ supplies already running low—or completely running out. On the other hand, the officials remained convinced that they would be able to achieve the administration’s goal of getting 100 million doses in arms in their first 100 days in office—a goal that has been criticized as being both too ambitious and not ambitious enough.

With 95 days to go until their goal’s deadline, the officials have made clear just how much work they face in getting vaccinations on track.