Updated at 7:25 p.m. ET.
A softer-edged Donald Trump huddled with Mexican President Enrique Peña Nieto in a hastily arranged meeting in Mexico City on Wednesday. Both men pledged a commitment to strengthening the U.S.-Mexico relationship.
Trump said he had a "very substantive" conversation with Peña Nieto during which he reaffirmed the right of the U.S. to protect its borders and build a wall, but that his pledge to make Mexico pay for it didn't come up.
"We didn't discuss that," Trump said.