The Pentagon said Thursday that Defense Secretary James Mattis spoke with President Donald Trump about using military funds to pay for the proposed wall on the U.S.-Mexico border. But the Pentagon didn't say there were any new developments.

Trump suggested the idea in a tweet on Sunday morning.

"What I can tell you is that the secretary has talked to the president about it," chief Pentagon spokesperson Dana White said describing the conversations as "initial."

When asked if taking money away from the service branches in order to fund Trump's wall would harm Mattis' goal of a maintaining a lethal military force, White responded, "I think that's a bridge too far because we don't have those details."

White added that "securing Americans and securing the nation is of paramount importance to the secretary."