Brian Kolfage, 37, created the fundraiser titled "We The People Will Fund The Wall", which has a $1 billion goal.
The campaign comes as debate over the wall continues in Washington, as Trump wages war with Democrats in Congress, who refuse to fund his proposal.
Within four days, more than 40,000 people have contributed to the campaign, donating more than $2.4 million to date. He said it's up to average Americans to raise the money, because he believes Democrats would rather see the president fail than the nation succeed.
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White House press secretary Sarah Sanders said Tuesday morning during an interview with Fox News that, "We have other ways that we can get to that $5 billion (for a border wall)". On GoFundMe's homepage, Kolfage's campaign was also one of the top fundraisers as of this afternoon.
'It's up to Americans to help out and pitch in to get this project rolling, ' Kolfage wrote on the page.
Trump doubled down on his campaign claims that Mexico would fund the wall in a Tweet Wednesday.
The crowdfunding page is now receiving donations in the names of former Secretary of State and presidential candidate Hillary Clinton, former President Barack Obama, and more.
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He's not the first person to suggest that the border wall be built with private funds.
It follows a heated exchange between Trump and House of Representatives Democratic leader Nancy Pelosi and Senate Democratic leader Chuck Schumer, last week, in which the President threatened to shut down the government over the border security dispute.
"It will be lovely and, at the same time, give our Country the security that our citizens deserve".
Either Trump never meant to build a wall and was scamming voters from the beginning or he hasn't the first idea in how to get it done and no interest in finding out...
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The President is yet to comment on the GoFundMe campaign.