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Ronald Vitiello, a career Border Patrol official who was backed by the agents' union, was named Tuesday as chief of the agency, less than a week after his predecessor resigned under pressure, reports the Associated Press .

U.S. Customs and Border Protection said on Twitter that Ronald Vitiello has been appointed to lead the agency at a time when President Donald Trump has pledged to erect a wall on the U.S. border with Mexico and add 5,000 agents from the current level of about 20,000.

The National Border Patrol Council - an early and outspoken backer of Trump's presidential bid - openly supported Vitiello for the job and pushed for the ouster of his predecessor, Mark Morgan, who resigned Thursday at the request of the new administration. Morgan stepped down only seven months after being named the first outsider to run the agency since it was created in 1924.

Vitiello, who was most recently CBP's executive assistant commissioner for operations support, was acting Border Patrol chief when Morgan was appointed last year and had been considered a leading contender for the job then. He joined the Border Patrol more than 30 years ago and served as deputy chief in the administration of President Barack Obama.