U.S. President Donald Trump speaking at a rally in Orlando, Florida, U.S., on June 18, 2019.

President Donald Trump raised a mammoth $36 million since officially announcing his 2020 relection campaign reelection last week.

Trump's seven-day haul is double the entire first-quarter fundraising total for Sen. Bernie Sanders of Vermont , whose $18 million led the field of two dozen Democratic presidential hopefuls.

At a donor event on Tuesday at the Trump International Hotel in Washington, the president raised $6 million with 225 people in attendance in support of his joint fundraising committee, according to Republican officials with direct knowledge of the matter.

The committee, called Trump Victory, distributes donations between the Trump campaign and the Republican National Committee.

Trump's total for Tuesday's event was barely short of the $6.3 million that former Vice President Joe Biden raised in his first day of campaigning for the Democratic presidential nomination.

The president's campaign, the joint fundraising committees and the RNC combined to pay his hotel nearly $610,000 for events held there throughout the 2018 election cycle, according to the nonpartisan Center for Responsive Politics.

Last week, after the president held his election rally in Orlando, Florida, RNC Chairwoman Ronna McDaniel announced that in the first 24 hours of his 2020 campaign, the president brought in $24.8 million.

He had a $6 million haul at a later luncheon at the Trump National Doral in Florida.

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Trump's closest advisors said they are going to continue to aggressively raise campaign cash as Democrats fight to overcome the big field of contenders.

"This time next year, we hope to have a huge advantage of money on hand as the Democrats will just be selecting a nominee and will have spent all of their cash to win the nomination," said Roy Bailey, a national finance co-chairman for Trump's reelection.

Bailey also said the campaign is "off to a booming strong start" and will be able to sustain the momentum through Election Day 2020.