Enrique Dupuy de Lôme in The Spanish-American War
Enrique Dupuy de Lôme (1816–1885) was a Spanish diplomat who's best known for a letter he penned to a Spanish official in Cuba in 1898.
On February 9th, 1898, the New York Journal published this private letter written by De Lôme. In it, De Lôme attacked President McKinley, calling him "weak," and "a low politician," and forewarned of American intervention in support of Cuban insurgents.
The American public fumed over the De Lôme letter, and called for war against Spain, so the private correspondence ultimately fueled popular cries for intervention in Cuba against Spain.