U.S. President Joe Biden speaks in the Eisenhower Executive Office Building in Washington, D.C., U.S., on Wednesday, April 21, 2021. Biden announced that the U.S. will achieve its goal on Thursday of giving 200 million vaccine shots in his first 100 days in office, while pivoting to a new phase of the campaign by urging businesses to make vaccination as accessible as possible. Pool Photo by Sarah Silbiger/UPI

U.S. President Joe Biden speaks in the Eisenhower Executive Office Building in Washington, D.C., U.S., on Wednesday, April 21, 2021. Biden announced that the U.S. will achieve its goal on Thursday of giving 200 million vaccine shots in his first 100 days in office, while pivoting to a new phase of the campaign by urging businesses to make vaccination as accessible as possible. Pool Photo by Sarah Silbiger/UPI

U.S. President Joe Biden speaks in the Eisenhower Executive Office Building in Washington, D.C., U.S., on Wednesday, April 21, 2021. Biden announced that the U.S. will achieve its goal on Thursday of giving 200 million vaccine shots in his first 100 days in office, while pivoting to a new phase of the campaign by urging businesses to make vaccination as accessible as possible. Pool Photo by Sarah Silbiger/UPI