Former Vice President Joe Biden made a bold promise on Tuesday to “cure cancer” if he is elected president in 2020.

At a campaign event in Ottumwa, Iowa, Biden expressed the difficulty one faces with a “loss” of a family member and others attempt to comfort them saying, “‘I know how you feel'” when in reality they have “no idea how I feel,” which is likely in reference to the loss of his son Beau Biden, who died in 2015 from brain cancer.

“That’s why I’ve worked so hard in my career to make sure that… I promise you if I’m elected president, you’re going to see the single most important thing that changes America, we’re gonna cure cancer,” Biden declared.

Biden, who lost his son Beau to brain cancer in 2015, oversaw the “Cancer Moonshot” initiative as vice president in the Obama Administration. The goal of the initiative was to make a decade’s worth of advances in cancer prevention, diagnosis, and treatment in five years.

In January 2016, during his final State of the Union address, President Barack Obama called on Biden to help make America “the country that cures cancer once and for all.” This led to Biden leading the “Cancer MoonShot” initiative during the Obama administration in a renewed effort to find a cure for cancer. Biden also launched the Biden Cancer Initiative after leaving office in 2016.

After leaving office, Biden oversaw the Biden Cancer Initiative, a nonprofit dedicated to helping patients navigate the process and decisions which come after a cancer diagnosis. He’s since stepped down after announcing his run for office.

Biden accused the Trump Administration of not prioritizing fighting cancer in April.

“I went to this administration and said, ‘You can do a lot. Move.’ But it wasn’t their priority at the time,” said Biden.

The Biden Cancer Initiative’s goal is to “develop and drive implementation of solutions to accelerate progress in cancer prevention, detection, diagnosis, research, and care, and to reduce disparities in cancer outcomes.”

Biden relinquished his role in the organization shortly after announcing his White House bid.

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