Sen. Bernie Sanders of Vermont raised $6 million in the 24 hours after joining the 2020 presidential race.

Just 10 hours after the announcement, Sanders had already raised more than $4 million from nearly 150,000 individual donors, the campaign said in an email.

Less than a week after announcing, Sanders is estimated to have collected $10 million from nearly 360,000 donors, campaign officials said to the New York Times.

Faiz Shakir, Sanders' campaign manager, said in an email to INSIDER that the numbers were "YUGE."

Sanders' figures set a new record for first-day donations in the 2020 race.

Sen. Kamala Harris, another 2020 Democratic candidate, previously held the title after raising $1.5 million from 38,000 donors within the first day of her campaign, Politico reported in January.

Sen. Bernie Sanders' campaign raised about $6 million in the 24 hours after the Vermont senator joined the 2020 presidential race. Less than a week later, campaign officials said they raised $10 million from nearly 360,000 donors, according to a New York Times report published Monday.

The initial $6 million came from roughly 225,000 donors with an average donation of $27, Sanders tweeted.

"Since yesterday morning, the response to our campaign has been incredible," Sanders previously said in his tweet. "We are just getting started. Let's stand together to transform this country."

Ten hours after announcing he would run in the 2020 US presidential election, Sanders had already raised more than $4 million from nearly 150,000 individual donors, the campaign said in an email last week.

Faiz Shakir, Sanders' campaign manager, could not confirm the exact dollar figure at the time but said in an email to INSIDER it was "YUGE."

Sanders' numbers set a new record in first-day donations in the 2020 race.

Sen. Kamala Harris, another 2020 Democratic candidate, previously held the title after raising $1.5 million from 38,000 donors within the first day of her campaign, Politico reported in January. Harris' first-day campaign donations averaged $37.

Sanders confirmed he was running for president during a previous interview with Vermont Public Radio.

"I wanted to let the people of the state of Vermont know about this first," Sanders said in the interview. "And what I promise to do is, as I go around the country, is to take the values that all of us in Vermont are proud of — a belief in justice, in community, in grassroots politics, in town meetings — that's what I'm going to carry all over this country."

"I have been very blessed in my life with good health," Sanders added. "I'm very lucky that as a kid I was a long-distance runner, and I think I had and still have a great deal of energy. So I would ask people to look at the totality of who I am — my energy level, my record in the US Senate — and not just at one criterion."

If elected, Sanders would be 79 years old at the time of his inauguration and the oldest US president in history.

He joins a number of other Democrats who have declared their candidacies, including Sen. Kirsten Gillibrand of New York, Sen. Elizabeth Warren of Massachusetts, Rep. Tulsi Gabbard of Hawaii, former Secretary of Housing and Urban Development Julian Castro, Sen. Cory Booker of New Jersey, former Rep. John Delaney of Maryland, the acclaimed author Marianne Williamson, and the former tech entrepreneur Andrew Yang.