The First Lady was chastised on social media after comparing the diversity of Latino people in the United States to breakfast tacos and bodegas. But she's now apologising.
On Monday, the first lady travelled to San Antonio to speak at the annual conference of UnidosUS.
UnidosUS, formerly known as the National Council of La Raza, is a Latino civil rights and advocacy organisation.
Before returning to Washington, she spoke at a Democratic Party fundraiser at a private residence.
She also mispronounced "bodegas," which are small urban stores that typically specialise in Hispanic groceries.
The National Association of Hispanic Journalists and others took to social media to express their outrage, with the journalists' organisation tweeting, "We are not tacos."
The first lady and her speech writers should "take the time in the future to better understand the complexities of our people and communities," according to the association.
Hispanic voters generally support Democrats, though their preferences vary greatly across the country.
Latinos back the Democratic presidential candidate.