The White House has acknowledged that the Biden administration is likely going to fall short of President Biden's stated goal of vaccinating 70 percent of American adults with at least one dose of COVID-19 vaccine by July 4.

16 states, plus Washington, D.C., have vaccinated more than 70 percent of their adult population, President Biden's chief medical adviser Anthony Fauci said Tuesday. Four states have vaccinated less than 50 percent of their population.

"The reality is, many younger Americans have felt like COVID-19 is not something that impacts them and have been less eager to get the shot," Jeff Zients, the head of the White House COVID-19 response team, said at a press briefing Tuesday.

(With input from agencies)