That September, the inspector general’s office released a 65-page report that described in detail how 13 Secret Service agents and officers had “personal encounters with female Colombian nationals” before Mr. Obama’s arrival.

In an interview with staff members of a Senate Homeland Security subcommittee after the report became public, Mr. Nieland said that during its preparation, he had been asked to delete derogatory information because it was potentially damaging to the administration during an election year. That information, he told the subcommittee investigators, was that a volunteer member of the White House advance team in Cartagena also had a prostitute in his room.

But in its own report, released this year, the subcommittee said the changes in the inspector general’s report were part of the ordinary editing process, and it found no evidence to substantiate Mr. Nieland’s claims. The White House also denied that it had intervened in the preparation of the report, and said it had investigated the allegations against the White House volunteer but determined that they were not true.

In recent months, congressional Republicans have cited Mr. Nieland’s statement as evidence that the White House mishandled its investigation of the Cartagena incident. Representative Jason Chaffetz, Republican of Utah, said in an Oct. 3 letter to the White House that he was concerned that Secret Service agents who were caught with prostitutes were “used as scapegoats to cover up what is potentially a broader problem.”

“Recently, I have received information from credible sources that records also identified a White House staff person as checking in a female foreign national as an overnight guest during the same trip and that steps were taken by the administration to cover up or deflect their involvement in the initial incident,” he said.

In 2013, according to department officials, Mr. Nieland accused the inspector general’s office of retaliating against him for making those allegations when it suspended him for two weeks without pay after he circulated photographs that he had taken of a female intern’s feet.

The intern asked to be transferred out of the office after the incident. Mr. Nieland, according to the officials, said he had circulated the images as a joke.