Donald Trump defended a plan on Friday in which U.S. initially would pay for a border wall with Mexico and then the cost of this wall will be paid back by its southern neighbor.

Trump tweeted that the dishonest media does not report that any money spent on building the Great Wall, will be paid back by Mexico later.

The proposed border wall between both countries was one of Trump's key campaign pledges. He vowed to make Mexico pay for this wall. His comments about "dishonest media" were related to reports that emerged lately and suggest that Trump was trying to modify his vow.

Funding for building the border wall with Mexico

Trump did not specify in his tweet if he would seek to build the wall with money of taxpayers, although he suggested in a speech a few months ago that U.S. government funds could be used at first to begin the project.

Incoming Trump administration press secretary Sean Spicer declared in an interview that the idea that we are going through the appropriations process and figuring out how to pay for it should not be a surprise to anybody.

Republicans are considering if to tie wall funding to a broader government funding measure in the spring, thus, it could make difficult for Democrats to oppose funding for the border wall.

Trump's proposal was not clear, but the Associated Press reported the president-elect's aides are pushing for a plan which would seek the economic resources through existing legislation such as the Secure Fence Act of 2006, which already authorizes some types of enclosures along the southern border of United States.

Mexico rejects the idea of paying for the wall

Spokesman Spicer declared that Trump will negotiate with Mexico over the payment for the border wall, which Mexico has rejected to pay for.

Enrique Pena Nieto, the Mexican President, has said that Mexico won't pay for the wall.