Former President Donald Trump on Thursday called himself “the father of the vaccine,” and declared that his administration had saved “tens of millions of lives” in its efforts to push for the quick development of COVID-19 shots.

“They’re very ungracious people,” Trump said of the Biden administration during a Fox Business interview on Thursday morning, bemoaning what he believed was undue credit attributed to his successor for the coronavirus vaccine’s development. “I did the vaccine.”

“If I weren’t president — the vaccine — you wouldn’t have a vaccine for five years, three to five years would be the minimum,” Trump continued. “I got it done in less than nine months. And that’s only because of me.”