Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) on Tuesday called for restructuring Immigration and Customs Enforcement (ICE) as part of a broader immigration overhaul, but he stopped short of calling for the elimination of the federal agency.

In a series of tweets, Sanders escalated his rhetoric opposing ICE, part of the Department of Homeland Security (DHS), as more lawmakers on the left call for the agency to be abolished.

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"In 2002 I voted against the creation of DHS and the establishment of ICE," Sanders tweeted. "That was the right vote. Now, it is time to do what Americans overwhelmingly want: abolish the cruel, dysfunctional immigration system we have today and pass comprehensive immigration reform."

"That will mean restructuring the agencies that enforce our immigration laws, including ICE," he added. "We must not be about tearing small children away from their families. We must not be about deporting DREAMers, young people who have lived in this country virtually their entire lives."

That will mean restructuring the agencies that enforce our immigration laws, including ICE. We must not be about tearing small children away from their families. We must not be about deporting DREAMers, young people who have lived in this country virtually their entire lives. — Bernie Sanders (@SenSanders) July 3, 2018

We must not be about forcing over 10 million undocumented people, many of whom have been here for decades, to continue living in fear and anxiety. Congress must do what the American people want. Let us create a humane and rational immigration system. — Bernie Sanders (@SenSanders) July 3, 2018

Sanders's office did not immediately respond to an inquiry about whether the senator supports eliminating ICE before comprehensive immigration reform is enacted.

Sanders, who's considered a likely Democratic presidential candidate for 2020, has faced pressure and criticism from the left after he declined to call for ICE to be abolished.

"I think what we need is to create policies which deal with immigration in a rational way," Sanders said in a CNN interview on June 24. "And a rational way is not locking children up in detention centers or separating them from their mothers."

"What we need is Trump to sit down with members of Congress and work on a rational program which deals with a serious issue," he added.

The issue has become a new litmus test for Democrats, particularly those thought to be weighing a presidential run in 2020.

Democratic Sens. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (N.Y.) and Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (Mass.) have in recent days come out in favor of abolishing ICE, while Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (Calif.) said the agency should be "critically re-examined."

Other Democrats have said they support examining the methods used by ICE, while noting that an agency is needed to enforce immigration laws.

President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has seized on the issue, saying Democratic support for abolishing ICE will ultimately hurt the party in November's midterm elections.