sentences:  After Trump signed an executive order in January 2017, mandating construction of the wall, Mexican President Enrique Peña Nieto cancelled a scheduled visit to the U.S. Trump said that Mexico would pay for the construction of the wall, but did not explain how; Mexico has in turn rejected the idea of any Mexican funding., prototypes for a revamped border wall had been completed, but U.S. Congress had only approved $341 million to maintain the existing barrier.The Trump administration's barrier construction so far has been limited to replacing sections that were in need of repair.