According to Michael Cohen, one of his frequent jobs was renegotiating bills on Trump's behalf.

"A law firm would send an invoice. He didn't believe that the invoice was fair, reasonable or justified, so he would give me the task of renegotiating a specific bill," Cohen said.

Cohen recounted his work repaying approximately 50 vendors related to Trump University at a discounted rate. All but two of the fifty vendors agreed to the discounted rate.

"They just went away," Cohen said of the two vendors.

"Did you pay then?" prosecutor Susan Hoffinger asked.

"No, ma'am," Cohen responded.

Cohen said Trump told him the outcome of the negotiation was "fantastic" and "great."

"How did that make you feel?" Hoffinger asked.

"Like I was on top of the world," Cohen responded.

Cohen told jurors that he began working for Trump after helping Trump with a series of legal favors.

"We ended up overtaking the board and resolving the issue which was to Mr. Trump's satisfaction," Cohen said about the first favor related to a board at a Trump property. "He liked the way that occurred and then continued to ask me if I would assist in other legal issues or matters he had."

"Did he pay you for that work?" prosecutor Susan Hoffinger said.

"No, ma'am," Cohen said

According to Cohen, Trump offered him a job after he presented Trump a $100,000 bill for legal costs related to the earlier favors.

"Would you want to come work for me?" Cohen recounted Trump saying. "I was honored, I was taken by surprise, and I agreed"

When asked about the $100,000 legal bill, Cohen said Trump "asked if I would like to get fired on the first day." The bill was never paid, according to Cohen, who immediately left his law firm to work for the Trump Organization as Trump's special counsel and a senior vice president.

When asked about the kind of work Cohen did for Trump, Cohen responded, "It was whatever concerned him -- whatever he wanted."

Cohen said he reported "just to Mr. Trump."

Michael Cohen briefly introduced himself to the jury, telling them how his father immigrated to California after surviving the Holocaust.

"Four children later, here I am," Cohen said about his parents.

Cohen told the jury that he went to law school at the urging of his family, though he did not want to practice law.

"I wanted to go to Wall Street," Cohen said.

He briefly explained how he acquired wealth with real estate investments and taxi medallions.

"I ended up going into business with a friend of mine who had grown up with me and we started purchasing buildings," Cohen said.

Cohen stood up in the witness box so he could identify Trump in the courtroom.

"He is wearing a blue and white tie," Cohen said while looking toward Trump.

"The people call Michael Cohen," prosecutor Susan Hoffinger said.

Michael Cohen entered the courtroom and took his seat in the witness box.

Donald Trump stared straight forward as Cohen walked into the courtroom. He did not appear to look toward Cohen.

Michael Cohen told jurors that he kept Donald Trump in the loop about his effort to kill a false story about Trump having a child out of wedlock, which was shopped by former Trump doorman Dino Sajudin.

"I provided him with all the information," Cohen said about his conversation with Trump.

"He told me to make sure that the story does not get out. You handle it," Trump said according to Cohen. "He asked me to speak to [the two employees] and let them know it was taken care of."

Pecker said he worked with David Pecker and Dylan Howard of the National Enquirer, who purchased the life rights to the story.

"Did you tell them that Mr Trump would be grateful?" Hoffinger asked.

"Absolutely," Cohen said.

Cohen said he offered feedback on AMI's contract with Sajudin, suggesting they add a $1 million penalty if Sajudin breached the contract.

When Cohen first became aware of Sajudin's claim, Cohen said, "I went to [Trump] immediately to advise him that there was a story -- because it was a negative story for him -- and to get his direction on what he wanted me to do."

Cohen said he shared the news of Sajudin's contract with Trump to keep him in the loop and "in order to get credit for accomplishing the task."

"What was Mr. Trump's reaction when you told him that?" Hoffinger asked.

"That's great," Cohen said Trump responded.