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 on Sunday defended his administration's immigration policies, which have led to the separation of migrant families, claiming "many are just using children for their own sinister purposes."

"Please understand, there are consequences when people cross our Border illegally, whether they have children or not," Trump tweeted.

He also blasted the country's existing laws as the "dumbest & worst" in the world, and urged followers to "vote 'R.' "

Please understand, there are consequences when people cross our Border illegally, whether they have children or not - and many are just using children for their own sinister purposes. Congress must act on fixing the DUMBEST & WORST immigration laws anywhere in the world! Vote “R” — Donald J. Trump (@realDonaldTrump) July 29, 2018

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Trump has repeatedly used heated rhetoric to cast suspicion on immigrants, accusing them of trying to "infest" the U.S. and suggesting immigrants are causing Europe to "[lose] its culture."

Meanwhile, the Trump administration continues to face backlash over a "zero tolerance" immigration policy that led to the separation of thousands of migrant children from their parents. The policy called for any individual crossing the border to be arrested, leading to the separations.

A court-ordered deadline for the government to reunite the separated children came and went on Thursday, and hundreds of young migrants remained apart from their parents.

A spokesman for the Department of Homeland Security said the government will continue to make "good faith" efforts to reunite all families.

The president has frequently asserted that no country has worse immigration laws than the United States as part of his ongoing efforts to crack down on illegal immigration. Trump has called on Congress to act on his wishes, typically blaming Democrats for congressional inaction.

The House last month failed to pass either of two GOP-crafted immigration measures, despite the party controlling the chamber.