Mr. Klein’s campaign did not answer an earlier question asking if it takes exception with any of the contributions to Mr. Koppell. But the senator’s campaign castigated Mr. Koppell for filing his disclosure form to the State Board of Elections (SBOE) after the July 15 deadline.

“On the campaign trail Mr. Koppell talks about campaign finance reform, a measure which Senator Klein continues to tirelessly advocate for in the State Senate, and yet, he cannot follow the rules of our current system,” the senator’s campaign said in an e-mail statement. “Mr. Koppell should be fined.” 

Mr. Koppell’s wife, Lorraine Coyle Koppell, said the campaign filed its disclosure reporter to the SBOE on July 15 at 8 p.m. But she said after the board told the campaign it could not open an attachment containing the report, the campaign tried again and again to send it until it finally worked on July 18.

“This attack is absurd,” Mr. Koppell said. “If this is the best they have, good, bring it on.”

Cabrera’s funds in question

Councilman Fernando Cabrera’s quiet campaign made headlines for the first time in weeks when a blog of The New York Daily News reported on Tuesday he had applied $33,000 from his city campaign funds to his race to unseat state Sen. Gustavo Rivera.

The outlet reported that the transfer included $23,000 in matching funds from the city, which election rules bar Mr. Cabrera from rerouting to his senate run.

A spokesman for Mr. Cabrera’s campaign said in an e-mail the move was “a result of not fully understanding our city’s campaign finance guidelines” and promised the discrepancy “will be rectified immediately.”