Sen. Ted CruzRafael (Ted) Edward CruzWarren goes local in race to build 2020 movement Trump holds chummy meeting with Turkey's Erdoğan Overnight Defense: Trump hosts Erdoğan at White House | Says Turkish leader has 'great relationship with the Kurds' | Highlights from first public impeachment hearing MORE (R-Texas) said Monday it was "reprehensible" that Rep. Ilhan OmarIlhan OmarKrystal Ball: Billionaires panicking over Sanders candidacy Omar renews claim Stephen Miller is a 'white nationalist' amid calls for him to step down Sanders 'very concerned about what appears to be a coup' in Bolivia MORE (D-Minn.) was receiving death threats.

“This is reprehensible,” Cruz tweeted. “Disagree with @IlhanMN on the merits, fine, but death threats to anyone are not a joke.”

The Texas senator spoke out after Chad Loder, the CEO and founder of tech company Habitu8, tweeted screenshots of death threats against Omar.

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“Maybe Twitter has improved its policing of death threats since ABCNews and WaPo covered this 6 months ago?” Loder tweeted. “Oh.”

Omar tagged Twitter, calling the threats “unacceptable.” 

The Minnesota Democrat has said she received an increase in death threats in April after President TrumpDonald John TrumpGOP senators balk at lengthy impeachment trial Warren goes local in race to build 2020 movement 2020 Democrats make play for veterans' votes MORE shared a video that included images of the 9/11 attacks interlaced with some of her comments.

In July, a crowd at a Trump rally in North Carolina chanted, “Send her back” in reference to Omar after the president tweeted that she and other women of color who serve in the House — Democratic Reps. Alexandria Ocasio-CortezAlexandria Ocasio-CortezSanders says Ocasio-Cortez will play a 'very important role' in his administration if he's elected Top Sanders adviser suggests polling underestimates campaign support Omar renews claim Stephen Miller is a 'white nationalist' amid calls for him to step down MORE (N.Y.), Ayanna PressleyAyanna PressleyJustice Democrats official denies that progressives struggle with electability The Hill's Campaign Report: Bloomberg looks to upend Democratic race Progressive freshmen jump into leadership PAC fundraising MORE (Mass.) and Rashida TlaibRashida Harbi TlaibKrystal Ball: Billionaires panicking over Sanders candidacy Sanders: Fighting anti-Semitism 'is very personal' Bloomberg run should push Warren to the center — but won't MORE (Mich.) — should "go back and help fix the totally broken and crime infested places from which they came."

All four lawmakers are U.S. citizens. Omar came to the United States as a Somali refugee.