FULL STATEMENT: President Trump Plans To Change Asylum Rules For Migrant Caravan

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President Trump announced in a lengthy speech at the White House on Thursday afternoon that, in response to what he called the "crisis at our southern border" and a surge of fraudulent asylum claims, his administration will require asylum-seekers to "lawfully present themselves" at a port of entry.

The move appeared designed to prevent many members of the leading Central American migrant caravan -- which now numbers approximately 4,000, down from a high of 7,200 -- to make asylum claims if and when they reach the U.S. border. Asylum claims made by migrants caught crossing the border illegally would be summarily denied under Trump's proposal.

The asylum clause of the Immigration and Nationality Act says that anyone who arrives to the U.S. may apply for asylum based on a well-founded fear of persecution, and Trump's decision was likely to prompt immediate federal court challenges.

In his remarks, Trump called the thousands of migrants in the approaching caravans from Central America "not legitimate asylum-seekers" because most of them have not decided to remain in Mexico and pursue asylum there. "Asylum is not a program for people living in poverty," he said.

The president also issued something of a warning to members of the caravan, including those who reportedly threw rocks at members of the Mexican police this week.

"We will consider that a firearm," Trump said. "We will consider that the maximum we can consider that, because they're throwing rocks viciously and violently. .... We're not going to put up with that. They want to throw rocks at our military, our military fights back. I told them to consider it a rifle. When they throw rocks, like they did at the Mexico military and police, I said, consider it a rifle."

Asked by a reporter to clarify if U.S. troops might fire on the caravan, Trump responded, "I hope not, I hope not -- but it's the military."