Trump's longtime ally turns on him

David Pecker, chairman of American Media Inc., which publishes the National Enquirer, cut an immunity deal in the Michael Cohen case.
3:36 | 08/24/18

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Transcript for Trump's longtime ally turns on him
And W begin tonight with what is fast bec one of the worst weeks for prent trump since he took office. Of his closest longe friends turning on president. A man knownor than a de. David pecker, CEO of thepany that own,"the national irer." Tting an immunity deal in the MI cohencase. A sou telling a news he helped prosecutors investigating co andh money payments for twomen during the campaign. Cohen pleading guilty to campaign finance allegations. ABC's chief justice correspondentrre Thomas leads us off. Reporter: He's bee friends with president trump fore than a decade. But David cker, publisher of "T natiol enquirer," has now beennted immunityn exchange for cooperatiith prosecutors. Arce tel ABC news, pecker has told invtors he wo with Michael Cohen to buy the silence of women who ced to have had affairs with trump and that trump knewut the deal pleadedlty early is week admitting his role in th scheme, he claims directed by ent himself. Osecutors say plan to protect trumpeg in 2015, just after the billionaire launched his campaign. They say pecker in coordination with Cohen and one ore memb of the campaign offered to help dealith negative stories Abou trump's relationship with women, specificalis the campaign in ideying such stories so they could be purchased and their publication avoided. A practice known as"catnd kill."a year leader, "The enquirer" bought T story of Karen Mcdougal. Were you in love withim? I was, yeah. And D T he was in love with you? He yeah. Reportehe Mcdougal story never ran in the tad. Cohen says heorked wit pec to bury , operating at the est of T candidate for T principle purpose influencing th election. Cohen later secretly record conversaon with trump W they seemingly discussed buying the rs mcdou story from pecker's company. I nee to open up a company for the transferf all of T info regarding ourend David, know,o that- Yeah. ING to thatight away. Reporter: Arce tel ABC news pecker told prosecutors he also work with Cohen to buy the sie of porn star stormy Daniels, and that trump knew abouthat deal, T the president's own story has been cg for months. This is W he TD Fox News this week. Did Y know about the payments? Later on I knew. Later on. Reporter: Andhe president furious Cohen H turned against hi Everything's wonderful and they get ten years in jail T fli on whoever the highest ones, or as high can go. It almost ought T be outlawed. It's not fa Reporter: With the political andal implications growing, the presi askedut the ct of men I don't know how you can impeach somebody who has done a great Jo I'll tell you what, if I ever impeached, I think the market would crash. I thinerybody would be very poor. All right, prre Thomas joins us livem Washington. And Pierre, I want to go backothat immunity deal with David pecker. We know alreadyave documents from the publisher? Reporter: That's ri Tom. Tonight, the assocpress is reporting that nquirer" had a safe fullfuments related to trump. The question tonight is WHE ose documents are in the Han federal investigators. Pierrek U. Tonight's other breaking Y, the extraordinary feud exploding between president

This transcript has been automatically generated and may not be 100% accurate.

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