Vice-President Kamala Harris has faced pressure to visit the US-Mexico border, as she tackled a record migration spike on her first official foreign trip.

Ms Harris had a testy exchange with a journalist who asked why she had not gone to the US southern boundary.

Members of Ms Harris’s own Democratic party meanwhile assailed her after she warned against illegal immigration.

On a visit to Mexico on Tuesday, she said Washington aimed to boost economic development in the region.

She and Mexican President Andrés Manuel López Obrador said it was in the interests of both countries to address the root causes of migration.

About 178,000 undocumented migrants arrived at the US southern border this April, the highest total in more than two decades.

The vice-president’s staff initially said the border was part of Ms Harris’s portfolio when US President Joe Biden assigned her in March to stem migration from Latin America. But aides have recently been seeking to distance her from the politically toxic crisis.

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