image copyrightGetty Imagesimage captionMs Harris visited Guatemala and Mexico earlier this month

US Vice-President Kamala Harris will on Friday make her first trip to the US southern border since taking office.

She has faced questions about why she has not visited the border since the White House assigned her in March to address the "root causes" of migration.

The visit was announced a week after former President Donald Trump said he would go to the border on 30 June.

The number of undocumented migrants reaching the US-Mexico border is at the highest level in more than 20 years.

  • 'Heartbreaking' conditions at US migrant camp

US Customs and Border Protection (CBP) said it caught 180,034 migrants in May. The number was up slightly from 178,854 in April and 172,000 in March.

Ms Harris will travel to El Paso, Texas, with Homeland Security Secretary Alejandro Mayorkas, according to White House officials.

Earlier this month, she made her first trip abroad as vice-president – travelling to Mexico and Guatemala to hold talks about the migration crisis with the leaders of those two countries.

  • Harris tells Guatemala migrants: 'Do not come'
  • Migrant numbers at US border hit new record high