The American Civil Liberties Union (ACLU) is handing out free, pocket-sized U.S. Constitutions to meet a rising demand after Khizr Khan, father of a Muslim-American soldier killed in action, offered to lend his copy to Republican presidential nominee Donald Trump in an electrifying speech at the Democratic National Convention last week.

The ACLU announced on Friday that it would give away free copies until Election Day, November 8, stating in an email to supporters, “Don’t get caught without the Constitution—everyone in the U.S. should know their rights.”

“Let me ask you, have you even read the United States Constitution?” Khan asked Trump during his speech on Thursday, pulling out a copy of his own as the audience erupted into applause. “I will gladly lend you my copy. In this document, look for the words, look for the words, liberty and equal protection [under] law.”

The Washington Post also reports Monday that since the speech aired, a $1 copy of the Constitution “printed by the nonpartisan National Center for Constitutional Studies became the second best-selling book on Amazon. It remains there today.”

And Google searches for the document went up more than tenfold on Friday compared to last month’s daily averages, the Post reported.

Army Capt. Humayun S.M. Khan was killed in action in Iraq in 2004. At the convention, Khan stood onstage with his wife Ghazala and addressed Trump in one of the week’s key moments, asking, “Have you ever been to Arlington cemetery? Go look at the graves of brave patriots who died defending the United States of America. You will see all faiths, genders, and ethnicities. You have sacrificed nothing and no one.”

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