Washington (CNN) Attorney General William Barr said his review into the origins of the Russia investigation could result in rule changes for the FBI's counterintelligence investigations of political campaigns.

"Government power was used to spy on American citizens," Barr told the Wall Street Journal in an interview published Friday. "I can't imagine any world where we wouldn't take a look and make sure that was done properly."

The Journal noted that Barr did not expand on the changes he wishes to make to bureau protocol.

The attorney general also told Fox News that "people have to find out what the government was doing during that period."

"If we're worried about foreign influence, for the very same reason we should be worried about whether government officials abuse their power and put their thumb on the scale," Barr said in an interview that aired Friday, adding, "I'm not saying that happened, but it's something we have to look at."