Senate Democrats protested President TrumpDonald John TrumpIran claims it rejected Trump meeting requests 8 times ESPY host jokes Putin was as happy after Trump summit as Ovechkin winning Stanley Cup Russian ambassador: Trump made ‘verbal agreements’ with Putin MORE's "zero tolerance" immigration policies, warning that Wednesday's executive order keeping migrant families together will only worsen the situation along the U.S.-Mexico border. 

Democrats, speaking from the Senate floor for roughly two hours, warned that the new policy raises fresh questions and warned it could result in the indefinite detention of children. 

"If you can imagine it what this executive order does is raise the possibility of children being in prison for very, very long periods of time. ...Does anybody really believe that we should be prisoning for an indefinite period of time little children," said Sen. Bernie SandersBernard (Bernie) SandersElection Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas House Dems launching Medicare for All Caucus Let's remove the legal shield from hackers who rob us of our civil rights MORE (I-Vt.), who caucuses with the Democrats. 

Sen. Dick DurbinRichard (Dick) Joseph DurbinDeal to fix family separations hits snag in the Senate Senate Democrats block resolution supporting ICE Senate Dems press for info on any deals from Trump-Putin meeting MORE (Ill.), the No. 2 Senate Democrat, added: "This president's executive order does not solve this problem. It makes it worse." 

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In addition to Durbin and Sanders, Democratic Sens. Jeff MerkleyJeffrey (Jeff) Alan MerkleySenate Democrats block resolution supporting ICE Senate Dems protest vote on controversial court pick Senate adds members to pro-NATO group MORE (Ore.), Amy KlobucharAmy Jean KlobucharHillicon Valley: EU hits Google with record B fine | Trump tries to clarify Russia remarks | Sinclair changing deal to win over FCC | Election security bill gets traction | Robocall firm exposed voter data Election security bill picks up new support in Senate Senate must approve Justice Served Act to achieve full potential of DNA evidence MORE (Minn.), Ron WydenRonald (Ron) Lee WydenNovartis pulls back on planned drug price increases The Hill's Morning Report — Trump’s walk-back fails to stem outrage on Putin meeting Meet the woman who is Trump's new emissary to Capitol Hill MORE (Ore.), Tim KaineTimothy (Tim) Michael KaineDem infighting erupts over Supreme Court pick Election Countdown: Latest on the 2018 Senate money race | Red-state Dems feeling the heat over Kavanaugh | Dem doubts about Warren | Ocasio-Cortez to visit Capitol Hill | Why Puerto Ricans in Florida could swing Senate race Green Day's 'American Idiot' climbs UK charts ahead of Trump visit MORE (Va.), Maggie HassanMargaret (Maggie) HassanNew Hampshire governor signs controversial voting bill Conway takes aim at congressional intern who yelled 'f--- you' at Trump Fox's Regan defends CNN's Acosta, calls for civility: 'What has happened to us?' MORE (N.H.), Mazie HironoMazie Keiko HironoUnions aren’t a thing of the past. Unions are our future. Administration to brief Senate panel on family reunifications Lawmakers press Trump admin for list of migrant kids separated from families MORE (Hawaii) Michael BennetMichael Farrand BennetHarley stunner spikes tension with Trump over trade policy Races to watch in Tuesday’s primaries Democrats protest Trump's immigration policy from Senate floor MORE (Colo.), Richard Blumenthal (Conn.) Kamala HarrisKamala Devi HarrisElection Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas Senate Democrats block resolution supporting ICE Dems look for candidate who will punch Trump ‘square in the face’ MORE (Calif.), Ed MarkeyEdward (Ed) John MarkeyDemocrats slam Trump for considering Putin’s ’absurd’ request to question Americans Hillicon Valley: Mueller indicts Russians for DNC hack | US officially lifts ZTE ban | AT&T CEO downplays merger challenge | Microsoft asks for rules on facial recognition technology | Dems want probe into smart TVs Dems push FTC to investigate smart TVs over privacy concerns MORE (Mass.) and Patty MurrayPatricia (Patty) Lynn MurrayDems to propose legislation to prevent ICE from shackling pregnant women Top Dems urge Trump officials to reverse suspension of ObamaCare payments Dems launch pressure campaign over migrant families MORE (Wash.) spoke from the floor. 

The string of floor speeches comes after Trump signed an executive order that requires that detained immigrant families are kept together "where appropriate and consistent with law and available resources."

The "zero tolerance" policy implemented by the Trump administration had resulted in the separation of immigrant parents and children when they were being detained along the border. 

Hirono recounted that when her mother left Japan she had to leave Hirono's three-year-old brother behind temporarily. 

"My younger brother left behind in Japan never really recovered from the trauma of his separation from his mother and his siblings. My mother always had deep sorrow about having to leave her baby behind," she said. 

The policies had sparked bipartisan backlash on Capitol Hill, where Republicans publicly called on Trump to back down as the issue spiraled into a political crisis. 

Kaine argued that the policy "triggered our moral gag reflex" 

Though Republicans have largely been supportive of the executive order, Democrat argued it would only make the problem worse and likely immediately being challenged in court. 

"It sounds like a return to the shameful internment camps of the 1940s during World War II during one of the darkest chapters of our nation's history," Markey said. "It was a mistake. That we should not even contemplate repeating." 

Democrats also raised concerns that the executive order did not address families that have already been separated, and would not help locate children who have already been placed in custody of the Department of Health and Human Services. 

Kaine recounted the story of a father who was separated from his family when he was taken into custody and committed suicide. 

"As we try to reassemble 2,300 families that this Administration has spread to the winds, there will be at least one three-year-old boy who will not be able to reunite with his father," Kaine said. "I ask this President, I ask the Attorney General, I ask the Secretary of Homeland Security: Was it worth it?” 

—Updated at 8:59 p.m.