According to Whitehouse.gov:
The history of the relationship between America and Muslim communities is deeper and more complex than the common perception might suggest. Thomas Jefferson taught himself Arabic using his own Quran kept in his personal library, and had the first known presidential Iftaar by breaking fast with the Tunisian Ambassador at sunset. President Dwight Eisenhower attended the dedication ceremony of the Islamic Center in Washington, D.C. on June 28, 1957. President Bill Clinton issued the first presidential greeting for Ramadan, appointed the first Muslim American …