Trump, who self-funded his entire primary campaign and launched fund raisers only in late May, ended the month with just USD 1.3 million in his kitty, Clinton was cash rich with USD 42.5 million on hand.
The mainstream American media said that Trump is "disastrously" short in cash.
In a statement, Trump argued that there is no reason to panic as he held the fund raising event only on May 25.
In an interview to Fox news, Trump said he helped raise USD 12 million for the Republican Party in a fundraising trip through Texas, Nevada and Arizona this month.
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His campaign said the month of June represents the first full month of fundraising activity for the campaign and this will be reflected in the June FEC report.
In a statement, the Hillary Campaign said it began June with more than USD 42 million in the bank after raising more than USD 28 million in May thanks to more than 650,000 contributions from about 430,000 people during the month.
The average donation during May was about USD 44.
"That grassroots support will be critical to our success and will ensure that we have the resources we need to communicate Hillary Clinton's message that we are stronger together."
Clinton brought in USD 28,275,817.46 through Hillary for America and the Hillary Victory Fund in May. She raised more than USD 9 million in May in contributions of USD 200 or less and more than 60 per cent of the campaign's contributions for the month were from women.