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 is beating back criticism over his terrible May fundraising report, claiming he has “unlimited” cash on hand to fund his campaign because he can put up as much of his own money as he wants.

“If need be, there could be unlimited ‘cash on hand’ as I would put up my own money, as I have already done through the primaries, spending over $50 million dollars,” Trump said in a statement. “Our campaign is leaner and more efficient, like our government should be.”

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Trump’s June fundraising report, posted late Monday night, received a mocking reception from political watchers and set off alarms among Republicans, who worry he’s not interested in raising money for himself or the national party and will get swamped by presumptive Democratic presidential nominee 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 in the general election.

Trump raised $3.1 million in May and finished the month with only $1.3 million in the bank. Clinton, meanwhile, raised $26.4 million over the same period and had $42.5 million on hand.

Trump essentially locked up the GOP presidential nomination on May 3 after winning the Indiana primary and knocking Sen. Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE (Texas) out of the race.

But in a statement released on Tuesday, Trump argued that “June represents the first full month of fundraising activity for the campaign” and that next month’s FEC filing should be used as a benchmark.

The campaign held its first fundraiser on May 25 and only recently began sending out fundraising appeals over email.

Trump recently completed a string of fundraisers in Georgia, Texas and Arizona, and he claims to have raised about $12 million on that swing.

“To date, the campaign’s fundraising has been incredible, and we continue to see a tremendous outpouring of support for Mr. Trump and money to the Republican Party,” Trump said. “The positive response to our fundraising efforts so far is a further indication that the country does not want yet another corrupt politician like Crooked Hillary.”