The letter focuses on companies connected to 1789 Capital and American Ventures, two investment firms affiliated with Trump's sons. The lawmakers haven't presented evidence establishing that Donald Trump Jr., Eric Trump or President Trump intervened in individual Pentagon decisions. At issue is a potentially substantial pool of federal business:At least 15 defense-sector companies linked to Trump family-affiliated investment firms. Likewise, an investment firm's stake in a federal contractor doesn't by itself establish that the company received preferential treatment. One proposal would establish a new code of conduct covering employees of the Office of Strategic Capital and other Pentagon investment operations.