Top House Democrats are asking federal agency watchdogs to conduct broad investigations into the Trump administration’s “zero tolerance” immigration policy, including the separation of children from their parents and the president's recent executive order designed to halt the practice.

“We have grave concerns about how the Department of Justice, Department of Homeland Security, and Department of Health and Human Services considered, prepared for, and executed these policies,” the Democratic lawmakers wrote in a letter Friday to the inspectors general of each agency.

The letter was signed by Reps. Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (Md.), Jerrold Nadler (N.Y.), Bennie Thompson Bennie Gordon ThompsonHouse panel pans ICE detention medical care, oversight Senate to hold nomination hearing for Wolf next week Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers MORE (Miss.), Bobby Scott Robert (Bobby) Cortez ScottCongress must finish work on popular conservation bill before time runs out House passes bill to allow private lawsuits against public schools for discriminatory practices Pelosi: House will stay in session until agreement is reached on coronavirus relief MORE (Va.) and Frank Pallone Jr. Frank Joseph PallonePharma execs say FDA will not lower standards for coronavirus vaccine Dem chairmen urge CMS to prevent nursing homes from seizing stimulus payments Federal watchdog finds cybersecurity vulnerabilities in FCC systems MORE (N.J.) — the ranking members on the committees for Oversight and Government Reform, the Judiciary, Homeland Security, Education and the Workforce, and Energy and Commerce, respectively.

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The lawmakers expressed concern that the agencies failed to put in place adequate protocols to reunite children and their parents before implementing the policy.

They added that news reports suggest the Trump administration has been deporting parents alone and may be coercing them to waive their legal rights and leave the country in order to be reunited with their children.

The Office of Refugee Resettlement at HHS has in custody more than 2,000 children who were separated from their parents after being brought into country illegally.

The administration’s “zero tolerance” immigration policy called for the separations, but 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 later signed an executive order designed to keep families together while in detention.

A federal judge this week ordered the administration to return immigrant children younger than five years old to their parents within two weeks. Older children must be reunited within 30 days, the judge ordered.

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The administration has failed to say how many children have been reunited with their parents since the order was signed, and it has given little indication that there is a plan in place to reunite families.

“The administration still has not provided consistent information on a family reunification plan, whether children are still being separated at the border, or whether your agencies have accurate information about whether detained children entered the United States as unaccompanied minors or were separated from their parents upon entry,” the Democrats wrote.

The HHS inspector general has already announced an investigation into the treatment of immigrant children at agency-run shelters. However, the probe will focus only on health and safety concerns.

The Democratic lawmakers said in their letter that while they support the effort, they want an expanded investigation.