http://newrepublic.com/post/180479/trump-rant-truth-social-sec-broken-law
Donald Trump’s Big Mouth Could Cost Him Even More on Truth Social. Did Donald Trump violate SEC rules?
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"Even after bragging about his assets and businesses got him in legal trouble, Donald Trump just can’t stop. After a rough week for his new social media venture, Trump Media & Technology Group, or TMTG, the former president ranted on his Truth Social account Thursday about how great the platform is doing—at least, in his opinion. But Trump may have broken some Securities and Exchange Commission rules in the process.
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"SEC laws prohibit the use of “manipulative and deceptive devices” to pump up stocks. Trump’s bragging in the face of heavy losses by his company could fall under that category, ... "
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The scuttlebutt is that several different law firms are already considering filing a multi-million dollar class action against Trump for suckering his MAGA cultists (who believe everything Trump says and do not bother to read SEC filings about the actual stock value and performance) into buying DJT to bolster Trump's personal stake and slow down the crash of the stock.  
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(Trump tried to pump and PAY (himself) previously:
http://www.theeroticreview.com/discussion-boards/politics-and-religion-39/is-this-the-100-m-tax-lien-439185
"... Trump was the chairman of Trump Hotels and Casino Resorts in Atlantic City from 1995 to 2009, his only outing as the head of a major public company. During that time, the company lost more than $1 billion, financial records show. He also was chief executive from 2000 to 2005, during which time share prices plunged from a high of $35 to as low as 17 cents. Trump received more than $44 million in salary, bonuses and other compensation during his time at the company, filings show.  ..."
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"... the company paid premium prices for two of Trump's deeply indebted, privately held casinos, the Trump Taj Mahal and the Trump Castle. In essence, he was both buyer and seller, able to set whatever price he wanted. The company bought his Castle for $100 million more than analysts said it was worth.  ..."
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"As millions of dollars in shareholder value evaporated, the company gave Trump a $7 million pay package, including a 71 percent raise to his salary, financial filings show. Trump defended his compensation by telling the Wall Street Journal, "Other than the stock price, we're doing great." “He ran these companies into the ground,” Graef Crystal, an executive-pay consultant who watched the company at the time, said in an interview. ..." )
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Let me remind readers of Trump's earlier "pump and dump" escapades in the 1980s.  
http://www.theeroticreview.com/discussion-boards/politics-and-religion-39/look-another-----338113
http://www.nytimes.com/interactive/2019/05/07/us/politics/donald-trump-taxes.html
"Decade in the Red: Trump Tax Figures Show Over $1 Billion in Business Losses"  
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"... As losses from his core enterprises mounted, Mr. Trump took on a new public role, trading on his business-titan brand to present himself as a corporate raider. He would acquire shares in a company with borrowed money, suggest publicly that he was contemplating buying enough to become a majority owner, then quietly sell on the resulting rise in the stock price. The tactic worked for a brief period — earning Mr. Trump millions of dollars in gains — until investors realized that he would not follow through."  With penny stocks and boiler room stock operations, that is known as PUMP AND DUMP.  "A pump and dump scam is the illegal act of an investor or group of investors promoting a stock they hold and selling once the stock price has risen following the surge in interest as a result of the endorsement."
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"The same tactic continued to work through 1988. Mr. Trump made a total of $57 million by briefly presenting himself as a takeover threat to, among others, Hilton Hotels, the Gillette razor company and Federated Department Stores, casino regulators found. In all, from 1986 through 1989, Mr. Trump declared $67.3 million in gains from stocks and other assets bought and sold within one year. By 1989, investors were less fooled by his moves. That September, he bought a large stake in American Airlines and announced a takeover bid. “I’m very skeptical of everything this man does,” Andrew Geller, then an airline analyst at Provident National Bank in Philadelphia, told The Associated Press.  Mr. Trump was rebuffed, and the stock price fell sharply. Though at the time his losses were reported to be modest, the new tax return figures show that in 1990, the year he sold his American Airlines stake, Mr. Trump lost $34.9 million on short-term trades, wiping out half his gains from the previous four years."
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"Mr. Trump had bought those shares [Alexanders Department Stores] for $67.9 million and held on, hoping to gain control of the company’s real estate with a partner. After climbing on the possibility of a takeover, the stock price slid. Mr. Trump ultimately agreed to turn over that stock and most of his other assets — including the yacht, the Trump Shuttle and his stake in the Grand Hyatt — to his lenders. On the day in 1992 when he gave up the stock, it was trading at about $9 a share — which would represent a loss of $55.5 million." That investment strategy is known as "Buy high, sell low."  
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In "1991, Mr. Trump testified before a congressional task force, calling for changes in the tax code to benefit his industry. “The real estate business — we’re in an absolute depression,” Mr. Trump told the lawmakers, adding: “I see no sign of any kind of upturn at all. There is no incentive to invest. Everyone is doing badly, everyone.”  Everyone, perhaps, except his father, Fred Trump. While Donald Trump reported hundreds of millions of dollars in losses for 1990 and 1991, Fred Trump’s returns showed a positive income of $53.9 million, with only one major loss: $15 million invested in his son’s latest apartment project." Trump said, "Everyone is doing badly, everyone" ... everyone who invests in Donald Trump.