Donald Trump says he doesn’t need daily intelligence briefings.

“I’m, like, a smart person,” he told Fox News’ Chris Wallace last weekend, explaining why he’ll be the first president since Harry Truman to avoid getting daily updates from intelligence professionals about national security threats.

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During and since his campaign, Trump has evoked these two themes. First, he’s skeptical of intelligence. Second, he’s smart.

The first is obviously true. The second is a matter of dispute.

Trump frequently boasts about how smart he is. Anyone who feels compelled to tell everyone how smart he is is clearly insecure about his intelligence and accomplishments. In Trump’s case, he has good reason to have doubts.

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Trump has the kind of street smarts (what he calls “gut instinct”) characteristic of con artists, but his limited vocabulary, short attention span, ignorance of policy specifics, indifference to scientific evidence and admitted aversion to reading raise questions about his intellectual abilities.

In 2004, in an interview with CNN, Trump said, “I went to the Wharton School of Finance. I got very good marks. I was a good student. It’s the best business school in the world, as far as I’m concerned.”

Trump has repeated that claim many times since. Each time, it isn’t clear if he’s trying to convince his interviewer or himself.

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In 2011, in an interview with ABC, Trump said: “Let me tell you, I’m a really smart guy. I was a really good student at the best school in the country,” referring once again to Wharton, the University of Pennsylvania's business school, where he earned a bachelor’s degree in 1968.

“I went to the Wharton School of Finance,” he said during a speech in Phoenix in July of 2015. “I’m, like, a really smart person.”

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In an interview on NBC’s “Meet the Press” in August 2015, Trump described Wharton as “probably the hardest there is to get into.” He added, “Some of the great business minds in the world have gone to Wharton.” He also observed: “Look, if I were a liberal Democrat, people would say I'm the super genius of all time. The super genius of all time.”

During a CNN-sponsored Republican town hall in Columbia, South Carolina, last February, Trump reminded the audience that he had gone to Wharton and then repeated the same boast: “Look, I went to the best school, I was a good student and all of this stuff. I mean, I'm a smart person.”

Trump frequently communicates via Twitter, which is not a good venue for displaying one’s linguistic prowess, but many observers have noted that Trump has a difficult time expressing himself and speaking in complete sentences. A linguistic analysis last year by Politico found that Trump speaks at a fourth-grade level. A study by researchers at Carnegie-Mellon University compared this year’s Republican and Democratic presidential candidates in terms of their vocabulary and grammar. Trump’s scored at a fifth-grade level, the lowest of all the candidates. Some might suspect that this is not an intellectual shortcoming but instead Trump’s calculated way of communicating with a wide audience. But Tony Schwartz, who spent a great deal of time with the developer while ghostwriting his book "The Art of the Deal," noted that Trump has a very limited vocabulary. It would hardly be surprising if these observations infuriated the vain and insecure Trump.

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Trump’s persistent insults directed toward anyone who disagrees with him also suggest deep insecurity. Before, during and since his presidential campaign, Trump has constantly denigrated his opponents and detractors -- among them actresses Rosie O’Donnell and Cher, businessman Mark Cuban, GOP political operatives Karl Rove and Ana Navarro, NBC’s Chuck Todd, Jeb Bush, Weekly Standard editor Bill Kristol and conservative columnist George Will -- as “losers.” It turns out that this is one of Trump’s favorite words. An archive of Trump’s Twitter account since 2009 found that he used the word “loser” 235 times. His other favorite insults include “dumb” or “dummy” (222 tweets), “terrible” (202), “stupid” (182), “weak” (154) and “dope” (115).

For example, on May 8, 2013, at 6:37 p.m., Trump tweeted: “Sorry losers and haters, but my I.Q. is one of the highest -and you all know it! Please don't feel so stupid or insecure, it's not your fault.”

At 3:52 pm on Sept. 26, 2014 – nine months before he announced his candidacy for the White House – Trump tweeted: “I wonder if I run for PRESIDENT, will the haters and losers vote for me knowing that I will MAKE AMERICA GREAT AGAIN? I say they will!”

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In contrast to his attacks on “losers,” Trump frequently retweets comments from others congratulating him for how “smart” he is.

Only someone who doubts his own intelligence would feel compelled to make these kinds of public statements.

Trump surely knows that he didn’t get into Wharton on his own merits. He transferred into Wharton’s undergraduate program after spending two years at Fordham University in New York. According to Gwenda Blair’s 2001 biography, "The Trumps," Trump’s grades at Fordham were not good enough to qualify him for a transfer to Wharton. Blair wrote that Trump got into Wharton as a special favor from a “friendly” admissions officer who knew Trump’s older brother, Freddy. The college’s admissions staff surely knew that Trump’s father was a wealthy real estate developer and a potential donor.

Moreover, Trump has exaggerated his academic accomplishments at Wharton. On at least two occasions in the 1970s — "A Builder Looks Back-and Moves Forward,” on Jan. 28, 1973, and “Donald Trump, Real Estate Promoter, Builds Image as He Buys Buildings,” on Nov. 1, 1976 -- the New York Times reported that Trump “graduated first in his class” at Wharton in 1968.

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That’s not true. The dean’s list for his graduation year, published in the Daily Pennsylvanian, the campus newspaper, doesn’t include Trump's name. He has refused to release his grade transcripts from his college days.

It is likely that Trump was the original source for that falsehood, but it isn’t entirely clear, since neither Times article attributes it directly to him. But the fabrication that Trump was first in his class has been repeated in many other articles as well as books about Trump, so he clearly knew that it was out there in the public domain and has never bothered to correct it.

“He was not in any kind of leadership. I certainly doubt he was the smartest guy in the class,” Steve Perelman, a classmate of Trump’s at Wharton, told the Daily Pennsylvanian last year.

Trump’s insecurity about his accomplishments is also revealed in his efforts to portray himself as an up-by-the-bootstraps self-made entrepreneur.

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“It has not been easy for me,” Trump said at a town hall meeting on Oct. 26, 2015, acknowledging, “My father gave me a small loan of a million dollars.”

At a news conference early this year, Trump repeated the same story: “I got a very, very small loan from my father many years ago. I built that into a massive empire and I paid my father back that loan.”

An investigation by the Washington Post in March demolished Trump’s claim that he made it on his own. Not only did Trump’s multi-millionaire father Fred provide Donald with a huge inheritance, and set up big-bucks trust accounts to provide his son with a steady income, Fred was also a silent partner in Trump’s first real estate projects:

Trump’s father — whose name had been besmirched in New York real estate circles after investigations into windfall profits and other abuses in his real estate projects — was an essential silent partner in Trump’s initiative. In effect, the son was the front man, relying on his father’s connections and wealth, while his father stood silently in the background to avoid drawing attention to himself.

Fred Trump’s real estate fortune was hardly due to his faith in the free market, but instead stemmed from his reliance on government subsidies. He made his money building middle-class apartments financed by the Federal Housing Administration (FHA). In 1954, when Donald was 8 years old, his father was subpoenaed to testify before the Senate Banking Committee on allegations that he had ripped off the government to reap windfall profits through his FHA-insured housing developments. At the hearings, the elder Trump was called on the carpet for profiteering off public contracts, including overestimating the construction costs of his projects in order to get larger mortgages from FHA. Under oath, he reluctantly admitted that he had wildly overstated the development costs.

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Donald has followed in his father’s corrupt footsteps. Trump’s career is littered with bogus businesses (like Trump University); repeated ripoffs of suppliers, contractors and employees whom he failed to pay for services rendered; and the misuse of the Trump Foundation to feather his own nest while trying to look like a philanthropist. Six of Trump’s businesses have gone bankrupt. Despite this, on April 18, 2015, Trump tweeted this falsehood: ”For all of the haters and losers out there sorry, I never went Bankrupt.”

Trump has also lied about the size of his wealth, as various business publications have pointed out. Many observers suggest that one reason Trump has refused to release his tax returns is that they will show that he has repeatedly and wildly exaggerated his wealth and thus his success.

Given this background -- his lackluster academic record, his dependence on his family’s connections and wealth to get into college and to succeed in business, and his troublesome and abusive business practices -- it shouldn’t be surprising that Trump is so insecure about his intellect and so thin-skinned about his accomplishments.