Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D-Mont.) said Sunday that the recent deaths of two migrant children in Customs and Border Protection custody are "everybody's fault."

"I think it’s everybody’s fault. This is unacceptable. And the bottom line is that if we’re able to get comprehensive immigration reform done, which is going to require some leadership from the White House too, then I think we will see things settle down on the southern border in a big, big way," he said on CBS's "Face the Nation."

.@SenatorTester says the child migrant deaths at the border are “everybody’s fault, this is unacceptable” pic.twitter.com/StSX3FzxPs — Face The Nation (@FaceTheNation) December 30, 2018

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Two migrant children from Guatemala — 7-year-old Jakelin Caal Maquin and 8-year-old Felipe Gómez Alonzo — have died in recent weeks while in U.S. custody near the border.

Democrats have pledged further investigations into the deaths after they take control of the House this week.

President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE, meanwhile, has tried to shift blame for the deaths to Democrats. Trump, who has demanded $5 billion in funding for a wall along the southern border to end a partial government shutdown, wrote in a tweet Saturday that the deaths were "strictly the fault of the Democrats."

"Any deaths of children or others at the Border are strictly the fault of the Democrats and their pathetic immigration policies that allow people to make the long trek thinking they can enter our country illegally," Trump tweeted.

Tester, who won reelection last month in a state that Trump took by double digits in 2016, on Sunday called on Democrats to "work for the country" and negotiate with the GOP to secure the borders.

“I think if we’re able to get a plan to be able to do that, which I don’t think is that hard to do, I think Democrats and Republicans can work together to make sure we have a secure border and keep this country safe," he said.