Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's presidential campaign claims to have quickly raised $2 million since making a rare pitch for small donations.

Trump's son Donald Trump Jr. said in a Wednesday email to supporters that his father had hit the mark in just 12 hours, Politico reported.

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The message also urged backers to continue donating and working to keep Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE, the presumptive Democratic presidential nominee, out of the White House.

“We all know what a disaster Crooked Hillary would be for this country if she were elected,” Trump wrote. "And the only way to stop her is to stand together and fight against her fraud and lies.”

The Trump camp sent out a fundraising plea to small donors Tuesday, promising to match donations coming within 48 hours up to $2 million.

Trump, the presumptive GOP presidential nominee, finished May with just $1.3 million on hand, a shockingly low figure, especially compared to Clinton's $42 million in the bank. Trump raised just $3.1 million last month to Clinton's $28.2 million.

The Trump campaign sent its first “emergency” fundraising email to supporters Saturday, seeking $100,000 by the day’s end.

The message came before Clinton launched a multimillion-dollar ad blitz in eight swing states this week, her first geared toward the general election.

Clinton has raised $238.2 million over her entire campaign, more than triple Trump’s largely self-funded $64.4 million.

Clinton leads Trump by about 6 points nationwide, according to the latest RealClearPolitics average of polls.