Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE on Wednesday warned that the federal government is prepared to prosecute Central American migrants from a caravan planning to cross the U.S. border this weekend.

Nielsen said in a statement that the Homeland Security Department is monitoring the caravan's movements, and "is doing everything within our authorities to secure our borders and enforce the law."

"Let me be clear: We will enforce the immigration laws as set forth by Congress," she said.

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"If you enter our country illegally, you have broken the law and will be referred for prosecution. If you make a false immigration claim, you have broken the law and will be referred for prosecution. If you assist or coach an individual in making a false immigration claim, you have broken the law and will be referred for prosecution."

Nielsen urged the migrants not to carry on into the U.S., saying that they should seek protection in the first country they entered since leaving their homes, including in Mexico.

Nielsen's comments came as the caravan of migrants arrived at the U.S.-Mexico border.

The first batch of asylum seekers are expected to try to enter the U.S. at a border crossing near San Diego on Sunday, The Associated Press reported. The group is mostly women and children.

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 has railed against the caravan in recent weeks. He tweeted on Monday that he had instructed the Homeland Security Department to repel migrants attempting to cross the 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. It is a disgrace," he tweeted. "We are the only Country in the World so naive!"