President Trump warned last week he will “call up the U.S. Military and CLOSE OUR SOUTHERN BORDER” with Mexico if officials there don’t stop the northward flow of a growing migrant Honduras caravan that’s swelled in size to about 4,000 people.

Mexico has released a statement that anyone with proper travel documents and the correct visa will be allowed to pass, and others may apply for a refugee status, but are also warned that those who try to cross in an “irregular manner” could be detained and deported, according to the Associated Press.

The Associated Press added that none of the migrants it spoke to who are making the journey were carrying passports, signaling a looming showdown with Mexican border officials in the coming days.

The president’s latest threat against the caravan that originated in Honduras — and which is heading to the U.S. in a bid to escape Honduras’ poverty and violence — comes as Secretary of State Mike Pompeo is heading to Central America to talk with leaders about the issue.

“I am watching the Democrat Party-led (because they want Open Borders and existing weak laws) assault on our country by Guatemala, Honduras and El Salvador, whose leaders are doing little to stop this large flow of people, INCLUDING MANY CRIMINALS, from entering Mexico to the U.S.,” Trump tweeted Thursday morning.

He added: “In addition to stopping all payments to these countries, which seem to have almost no control over their population, I must, in the strongest of terms, ask Mexico to stop this onslaught — and if unable to do so I will call up the U.S. Military and CLOSE OUR SOUTHERN BORDER!”

One of the Honduran migrants, Henry Tejeda explained to interviewers that he left his wife and four children behind to join the caravan. He said his mother was murdered four years ago and his brother was shot.

“I am carrying the documents to prove I’m not lying,” Tejeda said. “I want to seek political asylum (in the United States) and help my family.”

Secretary of State, Mike Pompeo, fresh off of traveling to Saudi Arabia and Turkey in accordance with discussions regarding the disappearance of activist and journalist Jamal Khashoggi – is now heading to Panama City Thursday and Mexico City tomorrow.