CIA, memo from Kermit Roosevelt to [Excised], July 14, 1953
Kermit Roosevelt conveys information about rapidly unfolding events in Tehran, including Mosaddeq's idea for a referendum on his remaining in office, the prospect of his closing the Majles, and most importantly the impact President Eisenhower's recent letter has had in turning society against the prime minister. The U.S. government publicized Eisenhower's undiplomatic letter turning down Mosaddeq's request for financial aid. The move was one of the ways Washington hoped to weaken his political standing.
Source: CIA Freedom of Information Act release