As school districts weigh whether to reopen classrooms for in-person instruction in the coming weeks, Dr. Scott Gottlieb, the former head of the Food and Drug Administration, warned there could be a surge in reports of post-viral syndromes that may be tied to the coronavirus, just as children prepare to return. In an interview with "Face the Nation" on Sunday, Gottlieb said illnesses such as pediatric multisystem inflammatory syndrome, clusters of which have been reported in the United States, are currently being investigated. Gottlieb said one study from the Centers for Disease Control and Prevention estimated the illness occurred roughly 25 days after children displayed symptoms for the coronavirus. "Given the fact that we've seen a spike in infections among kids, we would expect in about two or three weeks we might see a surge in these kinds of cases getting reported," he said. "That will be right about the time that we're looking at sending kids back to school. So that could cause a lot of districts to become wary." The Trump administration has been pressuring school districts to fully reopen for classroom learning for the fall semester, and President Trump has threatened to cut federal funding for schools that opt not to, though he lacks the authority to withhold federal dollars that have already been approved by Congress. Local and state officials, however, are weighing hybrid models of learning for students, which would include a mix of virtual and in-person learning, and have raised concerns about how best to protect students and staff from the coronavirus. Gottlieb said that while children are less likely to get infected with the coronavirus and less likely to be symptomatic, "what we aren't sure about is what their propensity is to spread the virus once they do get infected, and particularly when they're symptomatic." "They do appear as likely to spread the virus when they develop symptomatic illness," he said, "and that might be because they shed as much or because of their behaviors, that a child's more likely introducing it into the home because you're going to hug your child even when they're sick."