President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE said Monday he's ordered the Department of Homeland Security (DHS) to turn away “caravans” of immigrants attempting to enter the U.S. through the southern border.

“Despite the Democrat inspired laws on Sanctuary Cities and the Border being so bad and one sided, I have instructed the Secretary of Homeland Security not to let these large Caravans of people into our Country,” Trump tweeted.

Despite the Democrat inspired laws on Sanctuary Cities and the Border being so bad and one sided, I have instructed the Secretary of Homeland Security not to let these large Caravans of people into our Country. It is a disgrace. We are the only Country in the World so naive! WALL — Donald J. Trump (@realDonaldTrump) April 23, 2018

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He called U.S. immigration policy "a disgrace," and pushed for additional funding for his border wall.

"Mexico, whose laws on immigration are very tough, must stop people from going through Mexico and into the U.S. We may make this a condition of the new NAFTA Agreement," he added in a separate tweet.

Mexico, whose laws on immigration are very tough, must stop people from going through Mexico and into the U.S. We may make this a condition of the new NAFTA Agreement. Our Country cannot accept what is happening! Also, we must get Wall funding fast. — Donald J. Trump (@realDonaldTrump) April 23, 2018

Trump has in recent weeks warned multiple times of caravans of migrants making their way toward the U.S.

He appears to be referring to a group of more than 1,000 immigrants from Central America making their way toward the U.S. border who are planning to seek political asylum in either Mexico or the U.S.

Trump has used their progress to criticize Mexico and to call for Congress to enact stricter immigration laws.

He recently signed an order to deploy National Guard troops to the U.S. southern border.

His administration has also filed lawsuits targeting "sanctuary cities," which don't require local law enforcement to enforce federal immigration law.