The Islamic Center of Washington's diplomatic role, already visible at its 1957 dedication, reached a different kind of significance on September 17, 2001. Six days after the September 11 attacks, President George W. Bush visited the mosque and delivered remarks intended to separate the attacks from the religion invoked to justify them, telling the assembled crowd that the terrorists who committed the attacks violated the fundamental tenets of the Islamic faith and stating plainly that Islam is peace.
Bush's remarks came amid a documented rise in harassment and violence against American Muslims in the days immediately following the attacks, and he addressed that directly, saying Muslims who loved America should not be made to suffer for the actions of a small number of extremists claiming their faith. Researchers who later studied hate crime reporting in the following weeks found a measurable decline in anti Muslim incidents after the speech, though harassment did not stop, and the center's leadership has continued using its platform since to speak publicly against conflating terrorism with Islam.
The visit sits inside a longer pattern the mosque was built to serve. Conceived in the 1940s specifically to give the diplomatic community and visiting Muslim officials a dignified place of worship in the American capital, the center has hosted delegations, ambassadors and heads of state across seven decades, and Bush's remarks there, delivered at a moment of acute national anxiety, extended that founding purpose from ceremonial hospitality into an act of public reassurance the center's builders could not have anticipated needing.