US surging vaccine to states amid complaints of shortages

President Joe Biden delivers remarks on COVID-19, in the State Dining Room of the White House, Tuesday, Jan. 26, 2021, in Washington. (AP Photo/Evan Vucci)

FILE - In this Jan. 23, 2021, file photo, registered Nurse Shyun Lin, left, administers Alda Maxis, 70, the first dose of the COVID-19 vaccine at a pop-up vaccination site in the William Reid Apartments in the Brooklyn borough of New York. An increasing number of COVID-19 vaccination sites around the U.S. are canceling appointments because of vaccine shortages in a rollout so rife with confusion and unexplained bottlenecks. (AP Photo/Mary Altaffer, Pool, File)

FILE - In this Jan. 24, 2021, file photo, Dr. John Corman, the chief clinical officer for Virginia Mason Franciscan Health, holds a sign that reads “Need Vaccine” to signal workers to bring him more doses of the Pfizer vaccine for COVID-19 as he works at a one-day vaccination clinic set up in an Amazon.com facility in Seattle. An increasing number of COVID-19 vaccination sites around the U.S. are canceling appointments because of vaccine shortages in a rollout so rife with confusion and unexplained bottlenecks. (AP Photo/Ted S. Warren, File)

Answering growing frustration over vaccine shortages, President Joe Biden announced Tuesday that the U.S. is surging deliveries to hard-pressed states during the next three weeks and expects to provide enough doses to vaccinate 300 million Americans by the end of the summer or early fall.