Homeland Security Secretary Kristi Noem defended her department’s immigration enforcement tactics in front of a Senate committee on Tuesday and pushed back against criticism from Democrats who say she wrongly disparaged two protesters killed by federal officers in Minneapolis earlier this year.

It was Noem’s first congressional appearance since the shooting deaths of the two protesters galvanized widespread opposition to how the Trump administration is executing its mass deportation agenda, a centerpiece policy of President Donald Trump’s second term. At the time, Noem portrayed the protesters, two U.S. citizens, as agitators, although accounts from local officials and bystander video contradicted assertions from her and other administration officials.

In one exchange, retiring Republican Sen. Thom Tillis of North Carolina called her leadership a “disaster” and skewered her handling of the immigration crackdown and her management of emergency response.

In the hearing, which stretched nearly five hours, Noem defended her agency’s treatment of immigrants caught up in enforcement activities, and blamed activists and others for attacks against officers.

“I want to address the dangerous environment that our ICE officers face on the streets today,” Noem said. “They are facing a serious and escalating threat as a result of deliberate mischaracterizations of their heroic work and rhetoric that demonizes our law enforcement.”

Since the deaths in Minneapolis, the administration has taken steps meant to tone down tensions, including drawing down the operation there. But the administration has continued pressing restrictions against both legal and illegal immigration, has been buying up warehouses for immigration detention and persisting in federal enforcement in areas around the country. Noem said about 650 investigators remain in Minnesota as part of a broader fraud probe.

The immigration tactics of Noem’s department have triggered a clash in Congress over its routine funding, which remains unresolved, although a spending bill passed last year granted it a significant infusion of cash for the Republican administration’s mass deportation policy. Noem called the partial shutdown “reckless” and blamed Democrats for a move she said put national security at risk.

Her appearance in front of the Judiciary Committee also comes after a weekend shooting at a bar in Texas that is being investigated as a possible act of terrorism, leading to concerns that the escalating conflict in Iran could have repercussions for security in the U.S.

In what was initially billed as an effort to root out fraud in Minnesota, Homeland Security sent hundreds of officers from Immigration and Customs Enforcement and Customs and Border Protection to the state. They were met by protesters who organized marches, patrolled neighborhoods for ICE activity with whistles and ferried food to immigrants too afraid to leave their homes.

Renee Good, a 37-year-old mother of three, was shot and killed by an ICE officer on Jan. 7, setting off intense protests demanding an end to the operation. Then on Jan. 24, Customs and Border Protection officers opened fire on another Minnesota resident, nurse Alex Pretti, who had been filming enforcement operations.

Those deaths led to cries for accountability and transparency. Noem, whose initial comments portrayed both Good and Pretti as the aggressors, has come under withering criticism by Democrats and some Republicans, who have called for her to resign.

Democrats repeatedly questioned Noem about her initial comments and called on her to apologize.

“You and your agency rushed to brand these victims as, quote, domestic terrorists,” said Sen. Dick Durbin of Illinois, the top Democrat on the committee. “We have ample video evidence and eyewitness testimony proving you are wrong. Your statements caused immeasurable pain to these families.”