Trump attacked presidential hopeful Joe Biden on Monday morning, saying that stocks and 401ks would "disintegrate and disappear" under a Biden administration. That argument was contradicted by a recent research note from JPMorgan. The firm said a Biden White House would be a "neutral to slight positive" for equities, and added that a "diplomatic approach" would reduce volatility. Visit Business Insider's homepage for more stories. Might a Joe Biden presidency send the stock market into a nosedive and end months of steady gains?