Trump reveals what he may do to fund his border wall if Congress doesn't allocate the money

Securing America's borders and building a border wall is a promise that President Donald Trump made at each campaign stop during his historic run at the White House. Now, more than a year and a half into his presidency, Trump is focused on delivering on his promise.

He's so concerned with border security that he's admitted he's willing to shut down the government over funding for the wall. Whether a shutdown will happen at the end of September remains to be seen.

But Trump revealed to reporters aboard Air Force One late Friday that if Congress doesn't play ball and deliver funds for his promised border wall, then he may take matters into his own hands.

What did Trump say?

Trump said he's considering using military resources to finance the wall if Congress doesn't fund the project through the Department of Homeland Security, which has jurisdiction over U.S. borders. The project is estimated to cost taxpayers more than $20 billion.

"We have two options: We have military, we have homeland security," he said, according to the Daily Mail.

The president added that he would prefer to fund the project "the old-fashioned way — get it from Congress — but I have other options if I have to."

According to the Daily Mail, Trump was specifically asked about using the Army Corps of Engineers as a "taxpayer-funded construction crew." A Department of Defense official told the Daily Mail the Army Corps of Engineers are more than capable of making Trump's dream come true.

"They build levees that hold back massive walls of water. They can build one to hold back drugs and human traffickers," the official said.

Will Trump shut down the government over border wall funds?

Whether Trump will allow the government to shut down over border wall funds remains to be seen. He told reporters on Wednesday that he would be OK with a shutdown if it means attaining the funds necessary for border security.

However, he said one day later that he doesn't "like the idea of shutdowns," according to Reuters.

He flipped his position again on Friday, according to the Daily Mail, telling reporters aboard Air Force One that he is willing to allow a shutdown because border security is a "great political issue."

"If it were — I don't want to say 'up to me,' because it is up to me — I would do it because I think it's a great political issue," he explained.