Republican presidential front-runner Donald Trump confirmed Sunday that he gave as much as $250,000 to the Clinton Foundation, explaining he had an "obligation" to do so.

"I did give to the Clinton Foundation. What I didn't know is they'd be using it for private aircraft and things like that," Trump said on Fox News Sunday, according to Fox News. "The Clinton Foundation was helping with Haiti and with lots of other things, and I thought it was going to do some good work, so it didn't make any difference to me."

The billionaire businessman said that it was also in his interests to work with politicians across the political spectrum.

"Again, I was a businessman, and it was my obligation to get along with everybody, including the Clintons, including Democrats and liberals and Republicans and conservatives," he said, according to The Hill. "As a businessman, I had an obligation to do that."

Trump's philantrhopic endeavors have received extra scrutiny this week, as the real estate mogul held a fundraising event to benefit veterans' causes instead of participating in Thursday night's Fox News debate. Trump said Thursday that he raised more than $6 million for veterans groups at the rally in Des Moines, Iowa. Trump's campaign said that he pulled in the majority of funds from big donors -- including a $1 million contribution of his own -- and another $500,000 via his website, according to CNN.

However, not all veterans organizations were willing to accept Trump's funds. The prominent group, Iraq and Afghanistan Veterans of America, said that it wants none of the Trump funds. "If offered, IAVA will decline donations from Trump's event," founder and CEO Paul Rieckhoff tweeted. "We need strong policies from candidates, not to be used for political stunts."