Tentative plans for Mexican President Enrique Peña Nieto to make his first visit to the White House to meet with President Trump were scuttled this week after a testy call between the two leaders ended in an impasse over Trump’s promised border wall, according to U.S. and Mexican officials.

Peña Nieto was eyeing an official trip to Washington this month or in early March, but called off the plan after Trump would not agree to publicly affirm Mexico’s position that it would not fund construction of a border wall that the Mexican people widely consider offensive, said the officials, who spoke on the condition of anonymity to discuss a confidential conversation.

Speaking by phone on Feb. 20, Peña Nieto and Trump devoted a considerable portion of their roughly 50 minute conversation to the wall, and neither man would compromise his position.

One Mexican official said Trump “lost his temper.” But U.S. officials described him instead as being frustrated and exasperated, saying Trump believed it was unreasonable for Peña Nieto to expect him to back off his crowd-pleasing campaign promise of forcing Mexico to pay for the wall.