Donald Trump’s hush money trial reached a pivotal moment Monday when Trump’s onetime loyal attorney and fixer, Michael Cohen, took the witness stand to testify against his former boss.

As the prosecution’s case enters its final stretch, Cohen is providing jurors with an insider’s account of hush money payments at the center of the trial — payments he says were directed by Trump to fend off damage to his 2016 White House bid.

Cohen is expected be on the stand for several days and face intense grilling by Trump’s attorneys, who have painted him as a liar who’s trying to take down the presumptive Republican presidential nominee. Trump has denied any wrongdoing in the case.

Cohen testified that Trump feared Stormy Daniels’ story would be a “disaster” for his presidential campaign, which was already reeling at the time from the release of the infamous “Access Hollywood” tape in which Trump boasted about grabbing women sexually without their permission.

That testimony could be key for prosecutors, who are trying prove that Trump schemed to illegally influence the 2016 race by burying unflattering stories that could damage his campaign.

The defense has sought to show that the former president was trying to protect his family and reputation — not his campaign — by shielding them from embarrassing stories about his personal life.

Cohen testified that Trump was angry when he learned about Daniels’ story, telling him, “I thought you took care of this.”

Trump told Cohen: ‘This is a disaster, total disaster. Women are going to hate me. Women will hate me. Guys, they think it’s cool, but this is going to be a disaster for the campaign,” Cohen testified.

Cohen said he asked Trump how the story might impact his marriage with his wife, Melania. Cohen said Trump told him, “Don’t worry,” adding: “How long do you think I’ll be on the market for? Not long.”

Cohen said that comment led him to conclude that “this was all about the campaign.”