Former Trump Staffer 'Insulted' He's Only Being Sued for $10 Million

A former top Trump political adviser being sued by Trump for $10 million over allegations that he broke a confidentiality agreement by leaking confidential campaign information to the press says he's "insulted" that Trump isn't suing him for more.

"If you write $10 million, Mr. Trump, it's got to be $100 million, 150," ex-staffer Sam Nunberg told ABC News' Jonathan Karl in jest during an interview on "Powerhouse Politics" at the GOP convention, adding that it doesn't make him "look that good" if "I can only cause $10 million in damages."

Trump is seeking the damages in an arbitration proceeding in New York, according to Nunberg's affidavit, for backing Ted Cruz and over claims that he was the source of a leaked story to the New York Post about former campaign manager Corey Lewandowski.

While Nunberg may talk jokingly about the lawsuit, the dejected former staffer said he hopes the "mishigas" will be resolved "amicably" before the election and lamented the circumstances under which he says he was fired from the Trump campaign last year.

Ultimately, Nunberg said Trump was faced with a decision of whether to stand by Lewandowski or him.

"The campaign manager and I couldn't get along, and it was his decision that the campaign manager was more important," said Nunberg, who was fired in August over racially charged Facebook posts he had written several years prior.

But Trump didn't bring legal action against Nunberg until earlier this summer, many months after his firing from the campaign. So why now?

"This is just Mr. Trump being Mr. Trump," Nunberg said. "If I had to guess, very insulted I endorsed Ted Cruz during the primary, very insulted."

But Nunberg pointed to another possible explanation, again involving Lewandowski.

He believes Lewandowski was angered after Nunberg was quoted in Politico saying "Donald loves to fire people. Why can't he just say it to Corey?"

That quote came after a story about Lewandowski in the New York Post about an alleged argument between him and press secretary Hope Hicks. Neither Lewandowski nor Hicks has commented about the story.

Nunberg strongly denies leaking the story.

Beyond his own personal dejection over his firing and the subsequent lawsuit, Nunberg praised Trump as a candidate and said he plans to vote for him in November. "I don't think I was treated right, but I'm voting for him," he said.

As one of Trump's earliest political advisers brought on full-time to consult for Trump in 2014, Nunberg revealed the circumstantial advantages that he believes were ripe for Trump's unlikely rise in this year's election.

One major factor, Nunberg said, was that the Republican field was oversaturated with 17 candidates, allowing Trump to gain traction in the polls with what began as a modest level of support.

"We knew they were never going to take us seriously, we knew that," he said of the other campaigns. "It was the weakness of them not to take us seriously."

Describing Jeb Bush as "the perfect foil" for Trump's candidacy, Nunberg went on to compare Trump to a human Rorschach test -- in which people see what they want to see.

"Barack Obama said, 'I'm like a Rorschach test,' so could Donald, and that's what he did," he said.

"Anybody that underestimates Donald Trump is always making a mistake," he added.