Anti-Defamation League CEO Jonathan Greenblatt said the chants of "send her back" at President Trump's Wednesday night rally indicate a danger "to all Americans."

"This is the sound of illberalism, intolerance. Listen closely: it's a danger not just to immigrants and minorities but to all Americans," Greenblatt tweeted Thursday, with a clip of the rally chant.

This is the sound of illberalism, intolerance. Listen closely: it's a danger not just to immigrants and minorities but to all Americans. Put politics aside. Time for leaders from all parts of society, people from all walks of life, to step up and say: enough. https://t.co/ArYeu2KQu4 — Jonathan Greenblatt (@JGreenblattADL) July 17, 2019

The North Carolina crowd broke out into the chant after Trump renewed an attack on Rep. Ilhan Omar Ilhan OmarOmar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (D-Minn.), a freshman representative who is Muslim and was born in Somalia.

It followed days of Trump defending his tweets targeting Democratic Reps. Omar, Alexandria Ocasio-Cortez (N.Y.), Ayanna Pressley (Mass.) and Rashida Tlaib (Mich.).

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Trump told the representatives to "go back" to where they came from, a message widely denounced by Democrats and a few Republicans as racist.

All four of the freshmen representatives are women of color. Only Omar was born outside of the U.S.

The "send her back" chant set off a new round of backlash against the president for stoking racial division in America.