A group of Democratic senators called for President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE to restore presumptive release for pregnant migrants in a letter obtained by The Hill.

"In the absence of compelling evidence that the detention of a pregnant woman is necessary because she is a threat to herself or others, or is a threat to public safety or national security, the civil detention of an expectant mother for potential immigration offenses is never justified," the letter, which was sent to Immigration and Customs Enforcement (ICE) and Customs and Border Protection (CBP) on Monday morning, said.

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The senators urged ICE to bring back the Obama-era rule of presumptive release "for all pregnant women" in immigrant detention, which Trump reversed.

They also called on CBP to institute measures ensuring "timely and appropriate treatment" for pregnant women in its custody. The letter also requested detailed information from both agencies on availability of facilities and doctors for pregnant immigrants as well as more complete data on how many are currently in custody.

NBC first reported on the letter.

The letter, led by Sen. Catherine Cortez Masto Catherine Marie Cortez MastoDemocratic Senate campaign arm raised nearly M in August VA problems raise worries about mail slowdown, prescriptions Cortez Masto touts mail-in voting in convention speech MORE (D-Nev.), is signed by 2020 presidential contenders Sens. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.), Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.), Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), 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 (D-N.Y.), Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) and Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.).

Cortez Masto's office did not immediately respond to a request from The Hill for further information on the letter.

The request follows a Honduran woman delivering a stillborn boy after going into premature labor at an immigration detention center in Texas in February.

ICE has indicated that 28 women may have experienced a miscarriage just prior to or while in ICE custody over the past two years, per NBC.

The Trump administration stopped presumptively releasing pregnant women in March 2018. According to ICE's website, it now completes a case-by-case assessment of custody, taking “special factors” into consideration.

Neither ICE nor CBP immediately responded to a request for comment on the letter.