The first Honduran immigrants from a caravan heading toward the U.S. border reached Mexico on Thursday.

A group of as many as 4,000 migrants is traveling from Honduras through Guatemala with hopes of reaching the U.S.-Mexico border to flee poverty and violence in their home country.

CBS News reported that the group was approaching the Mexico border on Thursday.

The Mexican government has warned migrants participating in the caravan to turn around to avoid detention and deportation, saying they will not be allowed to enter the country as a group.

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Individuals attempting to enter Mexico will need to show a passport and visa, something few migrants have, or apply for refugee status, CBS News reported.

A record number of Central American families crossed the U.S.-Mexico border in September after crossing into Mexico, according to a report by the Washington Post.

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 Thursday warned that he may take military action to stop immigrants from crossing the southern border into the U.S. if Mexico does not take action to stop the "onslaught."

He has also threatened to cut off aid to Honduras if the government does not intervene with the caravan.

“The United States has strongly informed the President of Honduras that if the large Caravan of people heading to the U.S. is not stopped and brought back to Honduras, no more money or aid will be given to Honduras, effective immediately!" the president tweeted Thursday.

The United States has strongly informed the President of Honduras that if the large Caravan of people heading to the U.S. is not stopped and brought back to Honduras, no more money or aid will be given to Honduras, effective immediately! — Donald J. Trump (@realDonaldTrump) October 16, 2018

The U.S. gave $175 million in aid to Honduras in fiscal 2017, according to the United States Agency for International Development.

Trump accused “crazy Democrats” off being behind the caravan’s formation at a campaign rally in Montana on Thursday night.

“Now we’re starting to find out and I won’t say it 100 percent, I’ll put a little tiny question mark at the end…A lot of money’s been passing through, people to come up and try and get to the border by election day because they think that’s a negative for us,” he said.

“They wanted that caravan, and there are those that say that caravan didn’t just happen, it didn’t just happen. A lot of reasons that caravan…They like it, they also figure everybody coming in is going to vote Democrat. Hey, they’re not so stupid when you think about it right?” he added.

A similar caravan of Central American asylum seekers drew the ire of the president in April.