Colombian Prostitution Scandal Reaching Into White House
Mr Grassley urged investigators to check hotel records for White House advance staff and communications personnel who were in Cartagena for the Summit of the Americas.
In a letter to Mr Sullivan and the inspector general at the Homeland Security Department, Mr Grassley asked whether hotel records for the White House staffers had been pulled as part of the investigations.
He wrote: 'Have records for overnight guests for those entities been pulled as part of the investigation? If not, why not?'