Sen. Dick Durbin Richard (Dick) Joseph DurbinThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death MORE (D-Ill.) on Tuesday called for Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE to resign over the Trump administration’s “zero tolerance” immigration policy, which resulted in the separation of migrant children from their parents at the southern border.

“It is and was a cruel policy inconsistent with the bedrock values of the nation,” Durbin said during an oversight hearing of the government’s efforts to reunite the families. “Someone in this administration has to accept responsibility.”

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Department of Homeland Security spokesman Tyler Houlton said in a tweet that "obstructionists in Congress should get to work to secure our borders, end legal loopholes & protect American lives" instead of "criticizing a government official who is actually doing the job she was nominated, confirmed & sworn to do and enforcing the laws passed by Congress."

"@SecNielsen is committed to standing up for the law enforcement community, protecting the homeland and negotiating in good faith with serious members of Congress who want to fix our broken immigration system," he added.

Durbin, the second-ranking Democrat in the Senate, joins a growing list of senators calling out Nielsen for her role in the administration's separation of families.

Democratic Sens. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (Calif.), Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (Hawaii), Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (Ore.), Tammy Duckworth Ladda (Tammy) Tammy DuckworthMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Biden courts veterans amid fallout from Trump military controversies John Fogerty: 'Confounding' that Trump campaign played 'Fortunate Son' at rally MORE (Ill.), and Tina Smith Tina Flint SmithThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Credit union group to spend million on Senate, House races Health officials tell public to trust in science MORE (Minn.) have all demanded that Nielsen resign.

The Department of Health and Human Services (HHS) said it has reunited all children in its custody with eligible parents. According to a court filing, the government reunited 1,442 families with children ages 5 and older by a July 26 deadline.

But there are another 711 children in the care of the HHS Office of Refugee Resettlement whose parents are either not eligible for reunification or unavailable.

Updated at 11:54 a.m.