Donald Trump announced Friday he raised $6 million for veterans at his fundraiser in Iowa the night before.

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But this would appear a significant increase from what he's given to the cause before, according to some reports which questioned whether the billionaire businessman has been a consistent donor to vet groups.

Showbiz 411 reports that the Donald J. Trump Foundation gave a total of $2.6 million in charitable donations in the last three years, but only a fraction has gone to veterans groups. In 2012, Trump gave nothing, in 2013 he gave $6,000 and in 2014 he gave $16,000, according to the report.

The Weekly Standard reports that the the foundation donated $57,000 to veterans groups between 2009 and 2013, only a small amount of the $5.5 million it gave in total during that period of time.

The Trump campaign, however, is disputing the reports.

“These reports are not accurate. Mr. Trump has made substantial personal contributions to a number of Veterans organizations as well as in-kind donations,” Trump spokeswoman Hope Hicks told FoxNews.com Friday.

“These numbers only reflect contributions made through the Donald J. Trump foundation and do not reflect the many generous contributions Mr. Trump and his family make on a personal basis,” Hicks said.

The Weekly Standard reports that Trump’s foundation, meanwhile, gave at least $100,000 to the Clinton Foundation.

The Republican presidential candidate held the veterans event in Des Moines Thursday, after deciding to skip the Fox News/Google Republican primary debate.

FoxNews.com's Adam Shaw contributed to this report.