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President Trump hinted over the weekend that newly-approved funding for the military could be used for building the wall along the Mexican border.

The president said that "Building a great Border Wall ... is all about National Defense. Build WALL through M!" he wrote, referring to the military. 

White House Deputy Press Secretary Hogan Gidley said Monday he did not want to comment, citing a possible future announcement by the president on allocating the money. 

The president suggested on Twitter that the $1.6 billion allocated to border control in the government spending bill is "just a down payment."

"[Building a border wall] is something the president ran on, one of the reasons I think he got elected," Gidley said. "He understands that walls work."

He said the bill is only a "starting point" on the wall and that Trump had to agree to "trade-offs" with Democrats for their "pet projects" in order to keep his promise on rebuilding the military. 

More broadly, he said that the construction of a border wall is a major victory for Americans in the spending package. The wall - with an estimated cost of around $20 billion - was a pillar of Trump's presidential campaign as he repeatedly vowed that Mexico would pay for it. 

Watch the "Fox and Friends" segment above.

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