President Biden is greeted by Mexican President Andres Manuel Lopez Obrador as he arrives at the Felipe Angeles international airport in Zumpango, Mexico, on Sunday. Andrew Harnik/Associated Press

MEXICO CITY — Mexican President Andres Manuel López Obrador said Monday he would consider accepting more migrants than previously announced under President Biden’s plan to turn away people who cross illegally into the United States.

The comments came as López Obrador, Biden, and Canadian Prime Minister Justin Trudeau were gathering in Mexico City for a meeting of the three North American leaders.

“We don’t want to anticipate things, but this is part of what we are going to talk about at the summit,” López Obrador said. “We support this type of measures, to give people options, alternatives,” he said, adding that “the numbers may be increased.”

Jake Sullivan, Biden’s national security adviser, told reporters that conversations were continuing.

“What we need is to see how the program announced last week works in practice, what if any adjustments need to be made to that program and then we can talk about taking the next steps,” he said.

Ahead of the summit, Biden announced a major U.S.-Mexico border policy shift, with Mexico’s blessing. The U.S. will send 30,000 migrants per month from Cuba, Nicaragua, Haiti, and Venezuela back across the border from among those who entered the U.S. illegally. For those who enter legally, the U.S. will accept 30,000 people per month from those four countries for two years and offer the ability to work legally.

Sending even more migrants to Mexico could help resolve the problem of deporting people to their home countries with which the U.S. has shaky relations.

Biden arrived in Mexico on Sunday night via the new Felipe Angeles International Airport, a prized project of the Mexican president. The hub was christened last year with fanfare, though it’s more than an hour’s drive north of the city center, has few flights and until recently lacked consistent drinking water.

The two leaders took the long drive into the city center in Biden’s limousine. López Obrador was fascinated by the presidential vehicle known as “the beast,” and said Biden showed it off to him.

“He himself showed me how the buttons work,” Lopez Obrador said.

The Mexican president described the two leaders’ first encounter of the trip as “very pleasant,” and he said, “President Biden is a friendly person.”

It was a notably warm comment given that the men’s relationship has been merely transactional at best and absent the warmth and camaraderie Biden has with some other world leaders

López Obrador said the two also discussed “the migration issue … we agreed on addressing the causes of migration,” by generating more opportunities for people so they wouldn’t have to migrate.

He also talked about the economic integration of the nations, calling “it is a dream we can make a reality, which is to unite all the countries of the Americas.”

Trudeau was arriving later Monday, and the trio will spend the next two days discussing migration and other major issues.

“This gathering will deepen our coordination and advance our shared priorities for North America,” Biden tweeted after he arrived.

On his way to Mexico, Biden stopped in El Paso, Texas, for four hours – his first trip to the border as president and the longest he’s spent along the U.S-Mexico line. The visit was highly controlled and seemed designed to showcase a smooth operation to process migrants entering legally, weed out smuggled contraband, and humanely treat those who entered illegally. That would create a counter-narrative to Republicans’ claims of a crisis equivalent to an open border.

But it was likely to do little to quell critics from both sides, including immigrant advocates who accuse the Democratic president of establishing cruel policies, not unlike those of his hard-line predecessor, Republican Donald Trump.

The number of migrants crossing the U.S.-Mexico border has risen dramatically during Biden’s first two years in office. There were more than 2.38 million stops during the year that ended Sept. 30, the first time the number topped 2 million. The administration has struggled to clamp down on crossings, reluctant to take measures that would resemble those of Trump’s administration.

López Obrador will formally welcome Biden at the Palacio Nacional later Monday, the first time since 2014 that Mexico has hosted a U.S. president. The two leaders will meet together ahead of a private dinner for all three leaders and their wives. Biden and Trudeau will hold their talks Tuesday, and then the three leaders will gather for the main summit discussions.

For the U.S., the major talking points are migration, drug trafficking, and building on Biden’s push on electric vehicles and manufacturing. Mexico is focused on economic integration for North America, supporting the poor in the Americas, and regional relationships that put all governments on equal footing. Canada is looking to expand on green initiatives.

While the three nations work together, they still have their differences.

The leaders of Canada and Mexico have voiced concerns over Biden’s “Buy American” plan. And while Biden’s push toward electric vehicles is a boon to both U.S. neighbors because of the tax credits for North American batteries, there’s concern the U.S. allies will be left behind.

Meantime, the U.S. and Canada accuse López Obrador of trying to favor Mexico’s state-owned utility over power plants built by foreign and private investors, something that’s forbidden under the three countries’ free trade pact.

Biden’s relationship with Trudeau is warmer, but he still hasn’t made it to Canada during his presidency, despite White House officials saying for months he planned to head north following a summit of the Americas in Los Angeles last fall.

López Obrador skipped the California summit because Biden didn’t invite the authoritarian regimes of Cuba, Venezuela, and Nicaragua. He’s also made no secret of his admiration for Trump. And he was one of only three world leaders who didn’t recognize Biden’s election victory until after the formal Electoral College vote and the Jan. 6 insurrection at the U.S. Capitol. But despite this, they each recognize the other’s importance.

“They are both consummate politicians,” Andrew Selee, head of the immigration think tank Migration Policy Institute in Washington, said of Biden and López Obrador. “They’re looking for what the other person needs, and they’re trying to make clear what they need. It’s very transactional. There isn’t a big vision for the relationship right now.”

For Biden, that meant flying into the new airport, one of four keystone projects López Obrador is racing to finish before his term ends next year, as Mexico doesn’t allow reelection. The other projects are an oil refinery, a tourist train in the Yucatan Peninsula, and a train linking the Gulf coast and Pacific seaports.

López Obrador has faced much criticism over the airport which is expected to cost $4.1 billion and was built after he canceled the partly constructed airport created by his predecessor. During the construction of Felipe Angeles in 2020, hundreds of mammoth skeletons were uncovered.

Associated Press writers Andres Leighton in El Paso, Texas; Anita Snow in Phoenix; Morgan Lee in Santa Fe, New Mexico; Mark Stevenson in Mexico City and Chris Megerian and Josh Boak in Washington contributed to this report.