More than a dozen Republican senators are asking the Trump administration to halt the separation of immigrant families at the U.S.-Mexico border while Congress works out legislation.

GOP senators, led by Sen. Orrin HatchOrrin Grant HatchOrrin Hatch Foundation seeking million in taxpayer money to fund new center in his honor Mitch McConnell has shown the nation his version of power grab Overnight Health Care — Presented by PCMA — Utah Senate votes to scale back Medicaid expansion | Virginia abortion bill reignites debate | Grassley invites drug execs to testify | Conservative groups push back on e-cig crackdown MORE (Utah), sent a letter to Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsThe Hill's Morning Report — Presented by the American Academy of HIV Medicine — Trump, Congress prepare for new border wall fight The Memo: Trump and McCabe go to war McCabe book: Sessions once said FBI was better off when it 'only hired Irishmen' MORE asking for a moratorium of the president's controversial "zero tolerance" policy, which is resulting in the separation of families detained at the border.

"We support the administration’s efforts to enforce our immigration laws, but we cannot support implementation of a policy that results in the categorical forced separation of minor children from their parents," the Republican senators wrote.

"We therefore ask you to halt implementation of the Department’s zero tolerance policy while Congress works out a solution that enables faster processing of individuals who enter our country illegally without requiring the forced, inhumane separation of children from their parents," the senators continued.

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In addition to Hatch, GOP Sens. John McCainJohn Sidney McCainMark Kelly's campaign raises over M in days after launching Senate bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Lawmakers wait for Trump's next move on border deal Mark Kelly launches Senate bid in Arizona MORE (Ariz.), Pat RobertsCharles (Pat) Patrick RobertsGOP senators offer praise for Klobuchar: 'She’s the whole package' The Hill's Morning Report - House Dems prepare to swamp Trump with investigations The Hill's Morning Report — Will Ralph Northam survive? MORE (Kan.), Susan CollinsSusan Margaret CollinsBusiness, conservative groups slam Trump’s national emergency declaration The Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration On The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week MORE (Maine), Lisa MurkowskiLisa Ann MurkowskiThe Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration On The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week The Hill's Morning Report — Presented by the American Academy of HIV Medicine — Trump, Congress prepare for new border wall fight MORE (Alaska), Bob CorkerRobert (Bob) Phillips CorkerSasse’s jabs at Trump spark talk of primary challenger RNC votes to give Trump 'undivided support' ahead of 2020 Sen. Risch has unique chance to guide Trump on foreign policy MORE (Tenn.), Lamar AlexanderAndrew (Lamar) Lamar AlexanderCongress must move forward on measure dealing with fentanyl GOP advances rules change to speed up confirmation of Trump nominees Key doctors group faces political risks on guns MORE (Tenn.), John BoozmanJohn Nichols BoozmanGOP senators read Pence riot act before shutdown votes On The Money: Shutdown Day 26 | Pelosi calls on Trump to delay State of the Union | Cites 'security concerns' | DHS chief says they can handle security | Waters lays out agenda | Senate rejects effort to block Trump on Russia sanctions Senate rejects effort to block Trump on Russia sanctions MORE (Ark.), Dean HellerDean Arthur HellerTrump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Trump picks ex-oil lobbyist David Bernhardt for Interior secretary Oregon Dem top recipient of 2018 marijuana industry money, study finds MORE (Nev.), Cory GardnerCory Scott GardnerBipartisan Senators reintroduce legislation to slap new sanctions on Russia Dems seeking path to Senate majority zero-in on Sun Belt Lawmakers eager for 5G breakthrough MORE (Colo.), James LankfordJames Paul LankfordGOP advances rules change to speed up confirmation of Trump nominees GOP senator calls Omar's apology 'entirely appropriate' New battle lines in war over Trump’s judicial picks MORE (Okla.), Bill CassidyWilliam (Bill) Morgan CassidyIvanka Trump to meet with GOP senators to discuss paid family leave legislation Bipartisan senators ask industry for information on surprise medical bills Virginia abortion bill reignites national debate MORE (La.) and Rob PortmanRobert (Rob) Jones PortmanSteel lobby's PR blitz can't paper over damaging effects of tariffs Trade official warns senators of obstacles to quick China deal Lawmakers divided over how to end shutdowns for good MORE (Ohio) signed on to the letter to Sessions.

Trump's immigrant policies have fueled days of media coverage and sparked high-profile backlash from Republicans on and off Capitol Hill.

The senators added in their letter Tuesday that they've "read with increasing alarm" media reports of immigrant children being separated from their parents.

"Although enforcing our immigration laws is an essential responsibility of the federal government, it must be done in a way that is consistent with our values and ordinary human decency," the GOP senators added.

Sessions announced the "zero tolerance" policy in April as part of a move to prosecute adults who illegally cross the border to the fullest extent of the law. As a result, children are separated from their parents and detained as the adults are prosecuted.

Trump and administration officials have tried to shift the blame to Democrats, arguing that their hands are essentially tied.

But GOP senators rejected that in their letter, saying while the current "crisis has multiple contributing causes ... the immediate cause of the crisis is your Department’s recent institution of a 'zero tolerance' policy."

Senators are scrambling to come up with legislation that would deal narrowly with families detained at the border instead of a broader immigration bill like the proposals being debated by the House.

But there is no sign yet of a bill that can get 60 votes in the Senate. Sen. Ted CruzRafael (Ted) Edward CruzPoll shows competitive matchup if O’Rourke ran for Senate again Democrats veer left as Trump cements hold on Republicans O’Rourke heading to Wisconsin amid 2020 speculation MORE (R-Texas) is expected to introduce his own bill and a working group of GOP senators, led by Sen. John CornynJohn CornynPoll shows competitive matchup if O’Rourke ran for Senate again On The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week How the border deal came together MORE (Texas), are aiming to introduce legislation this week.

Meanwhile, Democrats have coalesced behind legislation from Sen. Dianne FeinsteinDianne Emiel FeinsteinFeinstein says she thinks Biden will run after meeting with him Trump judicial nominee Neomi Rao seeks to clarify past remarks on date rape Bottom Line MORE (D-Calif.) that Republicans believe is too broad and would result in immigrants who tried to enter the country illegally being released.

"Right now there is a full-on Democrat bill, that they've already put out. We'll have some Republican response to it. And then we've got to be able to work together to get an actual final bill that could actually pass," Lankford separately told reporters after a closed-door policy lunch.