Singer Lady Gaga poses during a photocall before a news conference promoting her new album "Born This Way" in Mexico City May 6, 2011. [Photo/Agencies]

MEXICO CITY - Singer Lady Gaga says she doesn't agree with Arizona's tough immigration law and wrote the song "Americano" as a response to it.

Lady Gaga is in Mexico City for two concerts.

She said during a news conference Friday she has a strong relationship to Mexican culture, then added: "I don't stand by many of those unjust immigration laws in my country."

An immigration law passed last year allows Arizona police officers to question the immigration status of people they suspect are in the country illegally.

That provision and others in the southwestern US state are on hold pending a court challenge.