The United States President Joe Biden administration's plan to open 100 vaccination sites by the end of the month was initially embraced by governors and health officials, who considered it a much needed lifeline to get more Americans inoculated against the coronavirus.

However, reality has quickly set in: Some are hesitating to take the offer, at least for now, saying they don't need more places to administer doses. They just need more doses.

Eager to protect more people against the coronavirus, health officials in Oklahoma jumped at the chance to add large, federally supported vaccination sites. They wanted them in Oklahoma City, Tulsa and a third, mid-size city, Lawton, thinking the extra help would allow them to send more doses to smaller communities that had yet to benefit.

"We felt like if we could get them in the metro areas, what that would allow us to do is free up a lot of our other resources to do more targeted vaccinations in underserved areas," said state Deputy Health Commissioner Keith Reed.

Those plans are now on hold after the state learned that the sites would not come with additional vaccines. Instead, the doses would have to be pulled from the state's existing allocation, and the three sites alone might have used more than half of Oklahoma's vaccine supply.

"We're not prepared to pull the trigger on it unless it comes with vaccine," Reed said.

White House chief of staff Ron Klain touted the initiative earlier this month after the initial sites were announced in Los Angeles and Oakland. Since then, the administration has announced a handful of others.

"We just opened our first two federal vaccination centers, in California this week," Klain told NBC News. "We're on our way to 100 of them by the end of this month.”

The White House told The Associated Press it could not provide a tally showing how many of the 100 new sites had been announced so far, but said it's confident it will hit its goal by the end of the month.