New York Attorney General Eric Schneiderman has issued a subpoena over the U.S. Chamber of Commerce's finances, just months before this year's U.S. elections, the Chamber said on Wednesday.

The Chamber gave no details about the subpoena, but a person familiar with the situation said Schneiderman was investigating whether a nonprofit affiliate funneled money to the Chamber for use in political activity.

Thomas Collamore, the Chamber's vice president for communications, said the subpoena by Schneiderman, a Democrat, was "curiously timed."

"In the midst of a highly charged political season, it comes as no surprise that the New York State Attorney General would use his office to rehash a very old story about the Chamber's finances," Collamore said in a statement.

In 2010, a group called U.S. Chamber Watch sent a letter to the Internal Revenue Service saying the Starr Foundation, a $1.25 billion foundation chaired by former American International Group Inc head Maurice Greenberg, had given about $19 million to the National Chamber Foundation.