Democrats reacted with outrage Saturday after 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 blamed them for the deaths of two migrant children who were in the custody of Customs and Border Protection officers.

Members of the incoming House majority on Saturday vowed investigations into the deaths of 8-year-old Felipe Gómez Alonzo and 7-year-old Jakelin Caal Maquin in U.S. custody after the president wrote on Twitter that the two children's deaths were "strictly the fault of the Democrats" for not funding his plans to build a wall along the border.

"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. They can’t. If we had a Wall, they wouldn’t even try," Trump wrote Saturday.

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"The two children in question were very sick before they were given over to Border Patrol. The father of the young girl said it was not their fault, he hadn’t given her water in days. Border Patrol needs the Wall and it will all end," he added.

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. They can’t. If we had a Wall, they wouldn’t even try! The two..... — Donald J. Trump (@realDonaldTrump) December 29, 2018

...children in question were very sick before they were given over to Border Patrol. The father of the young girl said it was not their fault, he hadn’t given her water in days. Border Patrol needs the Wall and it will all end. They are working so hard & getting so little credit! — Donald J. Trump (@realDonaldTrump) December 29, 2018

California Rep. Ted Lieu Ted W. LieuThe spin on Woodward's tapes reveals the hypocrisy of Democrats Larry Kudlow defends response to coronavirus: Trump 'led wisely' Lieu on Trump 'playing it down' on coronavirus: 'This is reckless homicide' MORE (D), a frequent critic of the president on social media, tweeted in response that Democrats would begin hearings in January on the issue upon taking the House.

"Is this when @realDonaldTrump became our President?" Lieu questioned, referring to a frequent line of discussion about the president from political pundits.

"Even #MAGA folks would concede that @POTUS is not a doctor. He's just making stuff up again," the lawmaker continued. "In January the House of Representatives will hold hearings with witnesses under oath and find out what happened."

Rep. Gerry Connolly Gerald (Gerry) Edward ConnollyJudge issues nationwide injunction against Postal Service changes House panel advances bill to ban Postal Service leaders from holding political positions Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (D-Va.), a member of the the House Oversight and Government Reform Committee, went further on MSNBC, where he accused Trump of lacking "any capacity for human empathy."

“The first reaction to the news of a death of a child in our custody ought to be empathy for the family and, frankly, enormous distress that that happened at all. It’s now the second such death," Connolly said Saturday.

"And instead, our president — who apparently lacks any capacity for human empathy — decides to use the death of two children as a political tool, something he can hit his opponents with. I think it’s really yet another new low in a president filled with new lows," he added.

Rep.-elect Harley Rouda Harley Edwin RoudaUS Chamber of Commerce set to endorse 23 House freshman Democrats OVERNIGHT ENERGY: Watchdog to weigh probe of Trump advancements on Pebble Mine | Interior finalizes public lands HQ move out West over congressional objections | EPA to issue methane rollback: report Watchdog to weigh probe of Trump administration advancements of Pebble Mine MORE (D-Calif.) added on Twitter that the president was using the children as "political pawns" in his ongoing battle with Congress on immigration reform.

"We need a President who doesn't view everything through a partisan lens. Felipe and Jakelin were human children @realDonaldTrump - not political pawns," Rouda tweeted.

We need a President who doesn't view everything through a partisan lens. Felipe and Jakelin were human children @realDonaldTrump - not political pawns. https://t.co/nfqhDluc5E — Harley Rouda (@HarleyRouda) December 29, 2018

The president has battled Congress for weeks over funding for his planned border wall, which last week led to a partial shutdown of the federal government. The shutdown dragged into its eighth day on Saturday, with no end in sight and most indications pointing to it lasting into January.

Democrats take the House majority on Jan. 3, when the new Congress is sworn in.