New York City Mayor Michael Bloomberg has donated $250,00 to the campaign to uphold a gay marriage law approved by Maryland lawmakers.

The Washington Post reported that it had confirmed the donation on Friday.

“As a business leader and Mayor of New York City, I do not believe that government has any business telling one class of couples that they cannot marry,” Bloomberg said in a fundraising email.

“Maryland will always hold a special place in my heart,” he added. “I went to college at Johns Hopkins in Baltimore, and have remained active in the Hopkins community. So when Governor O'Malley asked me to support Question 6, I didn't hesitate.”

Bloomberg, a Republican turned independent, strongly backed marriage equality in New York and played a key role in its passage there.

“Two years ago, I was proud to support the effort to pass marriage equality in the State of New York – and the bi-partisan support it received resulted in one of our state's great civil rights victories,” he said.

While Amazon CEO Jeff Bezos gave $2.5 million in support of a similar referendum in Washington state, Bloomberg's gift represents the largest individual donation to Marylanders for Marriage Equality, the coalition of groups working to approve Question 6.

(Related: Jeff Bezos gay marriage donation prompts One Million Moms to say “so long Amazon.”)