New York. The former publisher of the National Enquirer testified Thursday at Donald Trump's hush money trial about going to great lengths to help shield his old friend from potentially damaging stories using a catch-and-kill scheme prosecutors allege amounted to interference in the 2016 presidential campaign.

Jurors heard from David Pecker, the longtime head of the tabloid, who described shelling out hundreds of thousands of dollars to buy up rights to potentially damaging stories for Trump, some in secret moves meant to avoid scrutiny from colleagues.

Trump watched intently as his friend spoke from the witness stand.

Pecker explained how he and his publication parlayed rumor-mongering into splashy stories that smeared Trump’s opponents and, just as crucially, leveraged his connections to suppress seamy stories about Trump, including a porn actor’s claim of an extramarital sexual encounter years earlier.

His testimony was a critical building block for the prosecution’s theory that the partnership was a way to illegally influence the election. Prosecutors are seeking to elevate the gravity of the history-making first trial of a former American president and the first of four criminal cases against Trump to reach a jury.

As Pecker testified in a calm, cooperative tone about risque tales and secret dealings, the atmosphere in the utilitarian 1940s courtroom was one of quiet attentiveness. Court officers warned audience members not to talk or make any noise.

He also testified that he put his foot down on additional payments after the magazine was $180,000 in the hole for Trump-related transactions. The publication bought up a sordid tale from a New York City doorman and purchased accusations of an extramarital affair with a former Playboy model in order to prevent the claims from getting out elsewhere.

The breaking point for Pecker came with Stormy Daniels, the porn actor who was eventually paid by Cohen to keep quiet over her claim of a 2006 sexual encounter with Trump. The ex-president denies it happened.

Pecker recalled to the jury that he was dining with his wife, the night after the public learned of the infamous 2005 “Access Hollywood” tape in which Trump discussed grabbing women sexually without asking permission, when then-editor Dylan Howard called with an urgent matter.

Howard said he heard from Daniels’ representatives that she was trying to sell her story and that the tabloid could acquire it for $120,000 if it decided right away, Pecker told jurors.

Pecker was tapped out and later told Cohen so.

“I am not paying for this story. I didn’t want to be involved in this from the beginning,” he said he told Cohen.

At the same time, Pecker advised that someone -- just not him -- should do something to prevent the story from going public. “I said to Michael, ‘My suggestion to you is that you should buy the story and you should take it off the market because if you don’t and it gets out, I believe the boss will be very angry with you.’”

The 12-person panel watched attentively, with some appearing to take notes. Pecker also recalled receiving a telephone call from Trump during the tabloid’s pursuit of former Playboy model Karen McDougal’s claims of an extramarital affair with Trump.

A conviction by the jury in the hush money probe would not preclude Trump from becoming president again, but because it is a state case, he would not be able to pardon himself if found guilty. The charge is punishable by up to four years in prison -- though it’s not clear if the judge would seek to put him behind bars.