WASHINGTON — The top Democrats on the House Oversight and Foreign Affairs committees want an Israeli spy firm to share data on its alleged campaign against Obama administration officials associated with the Iran nuclear deal.

“We are writing to request documents relating to reports that Black Cube conducted a ‘dirty ops’ campaign against former Obama Administration officials Ben Rhodes and Colin Kahl at the behest of associates of President Donald Trump,” said the letter sent Thursday by Representative Elijah Cummings of Maryland, the top Democrat on the Oversight Committee, and Representative Eliot Engel of New York, his counterpart on Foreign Affairs.

“If these reports are accurate, they raise grave questions about how and why a foreign entity was engaged to attempt to secretly influence the foreign policy of the United States.”

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The letter was mostly symbolic: As the minority, Democrats do not have subpoena powers, and even with such powers, congressional authority over a foreign entity would be limited.

Black Cube, a company also alleged to have tracked alleged victims of movie mogul Harvey Weinstein, who was arrested Friday on rape charges, does not comment on its cases. At the time of the revelations that it was behind spying on Rhodes and Kahl, the firm said “It is Black Cube’s policy to never discuss its clients with any third party, and to never confirm or deny any speculation made with regard to the company’s work.”

Separately, a spokesman told The New York Times that “Black Cube has no relation whatsoever to the Trump administration, to Trump aides, to anyone close to the administration or to the Iran nuclear deal.”

The Guardian first reported that Trump administration officials were behind the operation to dig up negative information about Kahl and Rhodes, who were among dozens of Obama administration officials who helped shape the Iran deal, which swapped sanctions relief for a rollback in Iran’s nuclear program. According to that reporting, the operation supposedly was a bid to help justify Trump’s decision this month to pull out of the deal.

Other reporting said Black Cube was hired by an entity with commercial interests in quashing the Iran deal.

Cummings and Engel, both notably pro-Israel, said they were not taking on face value Black Cube’s claim that it has no ties to the Trump administration.

“Your firm has denied these reports only in the broadest terms, stating — in the present tense — that ‘Black Cube has no relation whatsoever to the Trump administration, to Trump aides, to anyone close to the administration, or to the Iran nuclear deal,’” they wrote. “You have not denied the operation itself, you have not explained who was aware of it, and you have not identified the clients who funded it.”