Brian Kolfage launched the GoFundMe page Sunday, and it had generated $9.7 million in donations as of Thursday evening. The site states a fundraising goal of $1 billion.
In a statement posted on the crowdsourcing page, Kolfage says the wall could be built if everyone who voted for Trump pledged $80 each.
"As a veteran who has given so much, three limbs, I feel deeply invested to this nation to ensure future generations have everything we have today," Kolfage wrote.
Trump announced Thursday he would not sign a bill to keep funding the government because it fails to provide billions for his border wall. It was his second reversal in a matter of days after conservative allies and pundits accused him of backing down on a central campaign promise. His decision has thrown Congress into disarray and risks a federal shutdown this weekend.
Kolfage, who is listed on GoFundMe as being based in Miramar Beach, Florida, said in an email that he was not immediately available to comment.
The reception toward Kolfage's fundraising is far from the reaction when Arizona lawmakers similarly tried to raise money for border fencing several years ago.
Legislators approved a bill in 2011 to establish a website to raise $50 million for border fencing. The effort, however, flopped, bringing in around $265,000.
This story has been corrected to show that Kolfage said each Trump voter should pledge $80 and that Kolfage is listed as being in Miramar Beach, not Miramar.