With a new president comes a new promise -- 100 million COVID-19 vaccinations in his first 100 days in office.

But can President Joe Biden deliver on his COVID-19 vaccine challenge despite a shortage of shots on Long Island and nationwide?

Sandra Lindsay, a Port Washington nurse, was the first American who received the vaccine outside of a clinical trial. She says Biden's all-out push could change the course of the pandemic.

"I think it's a great plan. I'd love to see it materialize," says Lindsay.

As News 12 has reported, many Long Island residents have had vaccination appointments canceled due to a lack of doses, while others are having trouble booking a time slot.

Dr. Aaron Glatt, with Mount Sinai South Nassau, says Biden's goal is achievable, but the supply chain would have to operate at full efficiency.

"There needs to be the ability on behalf of both Pfizer and Moderna to be able to actually produce that. Then you have the logistical issues in terms of delivering it, distributing it," says Glatt.

Earlier this week, Dr. Anthony Fauci said the Biden administration's goal is achievable, especially if more vaccines are authorized soon.

The president has said he plans to invoke the Defense Production Act, a law reserved for times of war, to ramp up manufacturing. It's not clear how long it will take before those changes are felt at vaccination sites.

For Lindsay, who is once again treating patients, it can't come soon enough.

"I'd encourage everyone not to give up hope, be patient, and healing is indeed coming," she says.