That's according to a person familiar with the matter who spoke Monday to The Associated Press.
The findings add to the intrigue surrounding the clash between the pro-Trump tabloid and the world's richest man.More news: England dominating 3rd test in lost series vs West Indies
U.S. President Donald Trump returns to the White House after receiving his annual physical exam at Walter Reed National Military Medical Center on February 8, 2019 in Washington, DC.
The brother, Michael Sanchez, is a supporter of President Donald Trump and an acquaintance of Trump allies Roger Stone and Carter Page. Still unresolved: why Sanchez allegedly supplied the information to the Enquirer; why the Enquirer promoted a story about Bezos with such vigor; what, if anything this had to do with the Enquirer's long-standing support for Trump; why its parent company was so bothered by the suggestion that it was motivated by "external forces, political or otherwise"; and why AMI tried to later coerce Bezos with a previously unreleased "d*ck pick".
The person says those investigators identified Michael Sanchez, a California talent manager, as the person who leaked the texts.More news: Cleveland Browns sign Kareem Hunt two months after assault video emerges
"It was a source that was well known to both Mr. Bezos and Ms. Sanchez", he told Stephanopoulos.
The battle between the National Enquirer and Bezos went nuclear when the outlet published a lengthy expose piece on his affair that it proudly presented as its "largest investigation" ever.
The investigators have since turned over the results of their probe to lawyer Richard Ben-Veniste for review and possible referral to law enforcement. Ben-Veniste had served as special prosecutor during the Watergate scandal. The people weren't authorized to discuss the matter and spoke on condition of anonymity.More news: Rohani Blasts U.S. 'Conspiracy' As Iran Marks 40th Anniversary Of Revolution
The National Enquirer said it followed Bezos and his mistress for four months, "across five states and 40,000 miles, tailed them in private jets, swanky limos, helicopter rides, romantic hikes, five-star hotel hideaways, intimate dinner dates and "quality time" in hidden love nests". On Monday, Fox News judicial analyst Andrew Napolitano said the Jeff Bezos-National Inquirer feud is "bad news" for Trump.