Democrats, led by Rep. Steven Horsford (D-Nev.), demanded that Greene (R-Ga.) remove the hat before Biden, 81, entered the chamber, but the Georgia Republican refused.

House floor rules ban head coverings for men and women alike, except for religious observances.

“Say her name. Laken Riley,” read the T-shirt Greene wore under her bright red blazer.

The congresswoman also pinned two buttons on her blazer — one that read “Say her name” and another with a photo of Riley.

Greene confronted Biden as he made his way to the lectern and handed him one of the pins, which he accepted.

“Laken Riley. Say her name, Mr. President,” Greene told Biden.

“I know how to say the name,” the president responded.

During his speech, as he discussed a bipartisan immigration and border bill that failed to make it out of the Senate earlier this year, Biden held up the pin and invoked Riley’s name, but he appeared to mispronounce it.

“Lincoln Riley, an innocent young woman who was killed by an illegal. That’s right. But how many of the thousands of people are being killed by illegals,” Biden said.

Greene was not satisfied.

“Utter disrespect,” she said in a tweet sent out during the State of the Union. “Joe Biden gets Laken Riley’s beautiful name wrong.“

“Even when he tries to say it, he can’t. Absolutely unfit to be President,” she added.

Riley, 22, was murdered by Venezuelan national Jose Ibarra last month, according to authorities.

“Even when he tries to say it, he can’t. Absolutely unfit to be President,” she added.

Ibarra, 26, entered the country illegally and had several run-ins with the law prior to Riley’s killing.

The House passed the Laken Riley Act hours before Biden’s speech, a bill that would require that migrants charged with theft or burglary be detained by federal immigration authorities.