A new report suggests that special counsel Robert Mueller has put together a "powerful" case against President Donald Trump.
Federal law enforcement officials have told Vox that acting FBI Director Andrew McCabe warned top law enforcement officials they should consider themselves witnesses in any investigation into whether President Trump engaged in obstruction of justice.
The warning came after Mueller was appointed as a special counsel to oversee the investigation into ties between Trump's campaign and Russian operatives. Mueller is also investigating whether Trump committed obstruction of justice by firing former FBI chief James Comey in May.
As many as ten of the nation's top law enforcement officials could be questioned about the case. Notes taken by the officials are also likely to be used as evidence.
"What you are going to have is the potential for a powerful obstruction case," one senior law enforcement official told Vox. "You are going to have the [former] FBI director testify, and then the acting director, the chief of staff to the FBI director, the FBI’s general counsel, and then others, one right after another."
"This has never been the word of Trump against what [James Comey] has had to say. This is more like the Federal Bureau of Investigation versus Donald Trump," the official added.
Comey stopped short of accusing Trump of obstruction of justice during a Senate Intelligence Committee hearing in June. Comey said he was stunned when Trump directed him to stop the investigation of national security adviser Michael Flynn, and he believed Trump fired him to influence the FBI investigation into his campaign's alleged ties to Russia.