The letter is dated May 8, when George H.W. Bush was running for president for the first time and George W., then 41, was working on his father’s campaign. Bush Sr. sent the same memo to his siblings and to his other children.

Across their three terms, father and son maintained a relatively clean image when it came to conflicts of interest, and Bush’s warnings present a stark contrast to president-elect Donald Trump. Throughout his transition, Trump’s conflicts of interest have been front and center. His first meeting with a foreign head of state, days after the election, included daughter Ivanka Trump, who oversees her father’s private business interests. Ivanka was also on the phone when Trump called Argentinian president Mauricio Macri, and had a prime seat at the table when Trump met US tech executives in his office on Dec. 14.

Trump has tweeted that he will be leaving his businesses “in total” when he assumes the presidency, but how exactly remains unclear. A Dec. 15 press conference to address his divestment plans in detail was canceled and rescheduled for January.

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