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.

Prosecutors introduced text messages between Michael Cohen and his daughter related to Cohen not being considered for Trump's chief of staff after Trump won the 2016 election.

"My daughter and I are very close -- we are very much connected and she was concerned that I was upset that I was not being considered for the role," Cohen said. "I explained to her that there are so many opportunities."

By December 2016, Cohen said, he was "beyond angry." His Trump Organization bonus had been cut by two-thirds.

"I was truly insulted, personally hurt. Didn't understand it," Cohen said of his feelings. "It made no sense, after all that I had gone through in terms of the campaign as well as things at the Trump Organization, and laying out $130,000 on his behalf to protect him."

"It was insulting that the gratitude shown back to me was to cut the bonus by two-thirds," Cohen said.

Cohen said he was "truly pissed off and angry," he recalled telling then-CFO Allen Weisselberg.

At that point, Cohen had not been paid back for the Daniels advance and expressed as much to Weisselberg.

"The best that you get for extending yourself as I did is to have your bonus cut by two-thirds?" Cohen recalled saying. He said Weisselberg responded by saying, "We'll make this right."

Trump, at the defense table, showed no reaction as Cohen recounted his emotional response to having his bonus cut.