"The current supply crunch is the one I’m most worried about," Walensky said on Fox News Sunday, adding "I can’t tell you how much vaccine we have, and if I can’t tell it to you, then I can’t tell it to governors and I can’t tell it to the state health officials."
White House chief of staff Ron Klain told NBC’s "Meet the Press" on Sunday that US President Joe Biden’s goal for 100 million COVID-19 vaccinations in his first 100 days in office was "not our final goal."
By Saturday, more than 20.5 million coronavirus vaccine doses had been administered in the US, according to CDC.
The United States has the highest coronavirus case count in the world (over 25 million), and the country’s COVID-19 death toll stands at over 419,000, according to Johns Hopkins University.