Source: The New York Times - Link
Local officials have expressed a hope that the Biden administration would step up vaccine production to make second doses available for the expanded pool of eligible people. Production of the Moderna and Pfizer vaccines authorized in the United States are running flat out, and it is not clear whether the administration could significantly expand the overall supply any time soon.
Biden is in a tough spot here. There is not much he can do to increase supply immediately. New vaccines will come online though and that may help in the next month or two.