Senator Edward J. Markey (D-Mass.) demanded that Immigration and Customs Enforcement (ICE) confirm or deny the existence of a “domestic terrorists” database that lists US citizens who protest ICE’s immigration crackdown.

ICE “officers and senior Trump administration officials have repeatedly suggested that the Department of Homeland Security (DHS) is building a ‘domestic terrorists’ database comprising information on US citizens protesting ICE’s actions in recent weeks,” Markey wrote in a letter yesterday to Acting ICE Director Todd Lyons. “If such a database exists, it would constitute a grave and unacceptable constitutional violation. I urge you to immediately confirm or deny the existence of such a database, and if it exists, immediately shut it down and delete it.”

Creating a database of peaceful protesters “would constitute a shocking violation of the First Amendment and abuse of power,” and amount to “the kinds of tactics the United States rightly condemns in authoritarian governments such as China and Russia,” Markey said.

Markey’s letter said DHS officials “have repeatedly stated that the agency is engaged in efforts to monitor, catalog, and intimidate individuals engaged in peaceful protests,” and gave several examples. Trump border czar Tom Homan recently told Laura Ingraham on Fox News, “One thing I’m pushing for right now, Laura, we’re going to create a database where those people that are arrested for interference, impeding, and assault, we’re going to make them famous. We’re going to put their face on TV. We’re going to let their employers, and their neighborhoods, and their schools know who these people are.”

Markey’s letter called Homan’s comment “especially alarming given the numerous incidents in which DHS appears to have concluded that protesting ICE itself constitutes grounds for arrest.” Markey pointed to another recent incident in Portland, Maine, in which a masked ICE agent told an observer who was taking video that “we have a nice little database and now you’re considered a domestic terrorist.”