Breaking: Trump makes a big announcement about how many troops are going to the border

President Donald Trump told reporters Thursday that there could be as many as 15,000 troops sent to the U.S. border in order to keep out thousands of migrants in a caravan from Honduras heading through Mexico to the U.S.

"We're not allowing people to come in."

The president spoke to reporters outside the White House on the South Lawn Thursday.

"I'm not fearmongering at all," Trump said, "immigration is a very important subject. The Democrats have let immigration in our country get out of control with their horrible ... not allowing us to have any votes to get past."

"As far as the caravan," he added, "which is very dangerous, you see what's been happening, as far as the caravan is concerned, our military is out, we have about five thousand, eight, we’ll go up to anywhere between 10 and 15 thousand military personnel, on top of Border Patrol, ICE and everybody else at the border."

"Nobody’s coming in," he added. "We're not allowing people to come in."

Trump said that the "roughness" of the migrants in the caravan had alarmed him and that he was speaking to the countries of their origin and telling them their foreign aid was in jeopardy over the migrant caravans.

"Immigration is a very very big and very dangerous," he explained, "a really dangerous topic and we're not gonna allow people into our country that don't have the well-being of our country in mind."

Here's the video of Trump's comments:

The first migrant caravan left from Honduras with about 1,000 people, but has swelled to 10,000 by some reports as it heads toward the U.S. border. Many migrants say they are seeking refugee status but others simply say they want a better life with more economic opportunities.