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 hammered the Democratic presidential contenders onstage for the primary debate Thursday night after all 10 said their health care plans would cover undocumented immigrants.

“All Democrats just raised their hands for giving millions of illegal aliens unlimited healthcare. How about taking care of American Citizens first!? That’s the end of that race!” the president tweeted from Japan during the Group of 20 summit

All Democrats just raised their hands for giving millions of illegal aliens unlimited healthcare. How about taking care of American Citizens first!? That’s the end of that race! — Donald J. Trump (@realDonaldTrump) June 28, 2019

The tweet came after the debate moderators asked the candidates to raise their hands if they would cover undocumented immigrants, to which all did.

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“Our country is healthier when everybody is healthier,” South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE said. “This is not about a handout, this is an insurance program. And we do ourselves no favors by having 11 million undocumented people in our country be unable to access health care. But of course the real problem is we shouldn’t have 11 million undocumented people with no pathway to citizenship.”

“As the mayor said, you cannot let people who are sick, no matter where they come from, no matter what their status, go uncovered. You can’t do that,” Biden added.

Immigration has emerged as one of the top animating issues for both parties, with Democrats vowing to curtail the threat of deportation and provide pathways to citizenship while Trump doubles down on hard-line policies to curb legal and illegal border crossings and ramp up deportations of migrants already in the U.S.