The administration of President Joe Biden has been struggling with the number of migrant children and families arriving at the U.S.-Mexico border, mainly from Central America, and Biden has tasked Harris with trying to solve the issue.
On her first trip abroad since taking office, Harris said talks with Lopez Obrador were "candid," covering topics, including security, vaccines, the pandemic and the spread of the drug fentanyl. She also said she would visit the U.S.-Mexico border.
"We made clear that the United States considers Mexico to be a partner on many of these issues," Harris told reporters after the meetings, hailing a "new era" of bilateral relations. Lopez Obrador called the encounter "pleasant and beneficial."
Harris and Lopez Obrador spent more than an hour in private meetings, as well as in broader talks, a White House aide said.