"They had a constructive conversation on a range of U.S. -Mexico collaboration including law enforcement, migration, and security", acting State Department spokesperson Mark Toner said in a statement, which did not include a date for Tillerson's trip to Mexico City.
An internal report from the U.S. Department of Homeland Security seen by Reuters puts the cost for President Donald Trump's proposed "wall" along the U.S. -Mexico border at up to $21.6 billion, far higher than the estimates put forth by Trump or Republican leadership.
It would also take over 3 years to build, according to the Reuters report.
More than 1,200 miles of walls would need to be erected to secure the border. And while he originally promised Mexico would pay for it, he's since said Congress will cover the costs upfront and that Mexico will pay taxpayers back. He wants Congress to approve the expenditure, which he maintains will be reimbursed by Mexico.
Mexican President Enrique Peña Nieto cancelled a scheduled meeting with Trump at the White House on January 26 after the new American leader pressured him to fund construction of the border wall.
The report also indicates that the project will require Trump to enforce "eminent domain", a principle which allows the federal government to seize private land "in the national interest", and which is highly controversial among many of Trump's core supporters who rail against "big government".
It also shows the USA government has begun seeking waivers to bypass environmental laws on building in some areas, started to work with contractors and is planning steel purchases for the project. The report estimated that agreement alone could bring the cost from $11 million per mile to $15 million per mile in one area.
The ensuing legal battle could add drive constructions cost up to as much as $25 billion, according to Bernstein Research, an investment research group that tracks material costs.
Estimates are now putting the wall's cost at $21.6 billion - almost double the amount Trump's campaign first claimed it would be, according to BuzzFeed.
That means constructing the remainder of the "wall" would cost a whopping $17.3 million per mile, or just short of $2000 for each of the estimated 11.1 million undocumented immigrants now living in the U.S. To build it would cost every adult taxpayer roughly $92.