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 Sunday said 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 must work with Democrats on immigration and make clear that the United States “is not a nation which tears children from their parents.”

“Clearly, anyone who looks at the record understands that the Democrats have been serious about comprehensive immigration reform, that’s what the American people want, and a path towards citizenship for people who are undocumented,” Sanders said during an interview on CNN’s "State of the Union."

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Sanders also bashed the Trump’s administration's “zero tolerance” policy, which resulted in the separations of thousands of children from their families at the border. Trump recently halted those separations by signing a narrow executive order.

Sen. Bernie Sanders: President Trump needs to "make it clear that the United States of America is not a nation which tears children from their parents" #CNNSOTU https://t.co/bUWdGqAWpd https://t.co/Q565TzZwSq — CNN Politics (@CNNPolitics) June 24, 2018

As a result of the policy, announced in April, more than 2,000 children were separated from their adult guardians and placed in detention centers while the adults await prosecution for illegally crossing the border.

“We have a president who's not serious about policy, a president who lies every single day, a president who told us that he couldn’t do anything about ripping children from the arms of their mothers and it had to be in Congress and then two days later he passed an executive order,” Sanders said on Sunday.

“We need Trump now to make it clear that the United States of America is not a nation which tears children from their parents.”

It remains unclear how or when thousands of children who were separated will be reunited with their families.