US Attorney General William Barr says he will raise the threshold for launching counterintelligence probes into presidential campaigns, after a report from the Justice Department inspector general highlighted errors made at the start of an investigation involving Donald Trump’s camp.

From here on, all investigations into presidential candidates or their campaigns will need the signatures of the attorney general and the FBI director, Barr said at a news conference Monday.

“We’re considering a number of additional things, and [FBI Director] Chris Wray and I have discussed a number of possibilities,” Barr said.

But “one of the things that we have agreed on is that the opening of a counterintelligence investigation of a presidential campaign would be something that the director of the FBI would have to sign off on and the attorney general would have to sign off on.”

Justice Department lawyers previously would review applications to the Foreign Intelligence Surveillance Act (FISA) Court and approve any investigations, according to Reuters.

While Justice Department Inspector General Michael Horowitz’s investigation did not find that political bias influenced the decisions surrounding the opening of probes into Trump campaign officials, the agency did conclude that the FBI’s investigation of Trump campaign adviser Carter Page was significantly flawed.

Horowitz also slammed the FBI for relying so heavily on ex-spy Christopher Steele’s unverified dossier, making members of the Trump campaign’s ties to Russia appear stronger than they actually were.

Former Special Counsel Robert Mueller found through his own investigation that while the Russian government worked to help the Trump campaign in 2016, there was no evidence uncovered that showed then-candidate Trump or anyone in his orbit were complicit. His investigation lasted for almost two years.