New York City Mayor Michael Bloomberg believes Vice President Joe Biden pushed President Barack Obama on gay marriage.

During a May appearance on NBC's Meet the Press, Biden told host David Gregory that he is “absolutely comfortable with the fact that men marrying men, women marrying women.” He then added, “The president sets the policy.”

Within days, Obama moved from supporting civil unions for gay couples to full marriage, making him the first sitting president in history to do so.

While the White House has denied it, many have questioned the timing of the president's announcement.

In an interview with The New York Times, Bloomberg said he was not seeing “as much action as I would like” from the president on social issues.

The mayor was asked how he could make such a criticism given the president's support on the marriage issue.

“Let's get serious here: it was Joe Biden that forced that issue. Some people say he just goes off; I would say he's a principled guy,” Bloomberg answered.

(Related: Michael Bloomberg gives $250,000 to uphold gay marriage in Maryland.)