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.

Defense attorney Todd Blanche accused Michael Cohen of lying about a phone call Cohen testified he had with Donald Trump on Oct. 24, 2016.

Blanche read texts between Cohen and Trump aide Keith Schiller on that date, in which Cohen asked Schiller, "Who can I speak to about harassing calls to my phone and office?"

According to Blanche, Schiller asked Cohen to call him at 8:02 p.m.

"This is the call that you testified about on Tuesday that you had a conversation with President Trump?" Blanche said.

Cohen, who testified on Tuesday that he had called Schiller to speak with Trump, agreed.

Nearly shouting, Blanche alleged that Cohen lied during his testimony on Tuesday.

"That was a lie," said Blanche, adding that Cohen texted Schiller the phone number of the 14-year-old prank caller at 8:04 p.m.

"Part of it was the 14-year-old, but I knew that Keith was with Trump at the time," Cohen responded.

"That was a lie. You did not talk to President Trump that night," Blanche said, raising his voice. "You can admit it."

"No sir, I can't," Cohen said. "Because I'm not sure that's accurate."

"This jury doesn't want to hear what you think happened," Blanche said.

Trump, at the defense table, appeared engaged and furrowed his eyebrows.

The jury was then shown text messages from that evening between Cohen and Schiller, which Blanche suggested prosecutors omitted from their exhibit.

"Mr. Cohen, you just said that you don't recall a phone call ... on Tuesday you testified that you remembered the phone call," Blanche shouted, again growing animated and speaking quickly.

Cohen stood by his testimony, saying he spoke to both Trump and Schiller.

"Based upon what was going on and based upon the other messages regarding the Stormy Daniels matter, yes I believe I was telling the truth," Cohen said.

Judge Merchan subsequently recessed the court for lunch.