Story highlights Donald Trump's campaign manager said Thursday that the Republican front-runner has given more than $100 million to charity

"We'll be happy to release that information," Corey Lewandowski told CNN's Wolf Blitzer

Washington (CNN) Donald Trump's campaign manager said Thursday that the Republican front-runner has given more than $100 million to charity.

"I know that Donald Trump has donated over $100 million to charitable causes over the last number of years. $100 million. That's an insane amount of money by any standard," Corey Lewandowski told CNN's Wolf Blitzer.

"We'll be happy to release that information. (The Trump family has) been tremendous supporters of non-profit causes throughout the years. Mr. Trump has been phenomenal about donating his time, his efforts, his land and his money to charitable causes for many, many years," he added.

"I'll give you a full accounting of the 100-plus million dollars that he's provided to charitable causes through the years," Lewandowski said.

Earlier Thursday, Mitt Romney, imploring Republicans to oppose Trump's candidacy , reiterated his claim that there is a "bombshell" in Trump's tax returns, suggesting Trump doesn't give nearly as much to veterans as he claims.

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