Of all the scandals swirling around the Trump White House, the Republican fund-raiser Elliott Broidy is in a category of his own.

Documents from the office of the president’s personal lawyer, Michael D. Cohen, revealed that Mr. Broidy had agreed to pay $1.6 million to a former Playboy model to keep her quiet about their affair, which led her to get an abortion. And emails stolen from his account showed he had used his White House access on behalf of the rulers of the United Arab Emirates while landing hundreds of millions of dollars in contracts with them for his private defense company.

Mr. Broidy, though, is not going quietly. His lawyers said this week that, after more than 80 subpoenas and months of forensic analysis, they had managed to identify as many as 1,200 other individuals targeted by the same cybercriminals.

The list of names the lawyers compiled, they argue, will bolster Mr. Broidy’s case that the rulers of Qatar — the tiny Persian Gulf emirate that is a nemesis of the U.A.E.— had targeted him for his advocacy against them.