“While I will not become the permanent director of ICE, I look forward to working alongside you in serving the American public with integrity, courage and excellence,” Mr. Vitiello said in the email, which was read to The New York Times by an ICE employee on the condition of anonymity.
One person familiar with the president’s thinking said that Mr. Trump believed that Mr. Vitiello did not favor closing the border, as the president had proposed before backing off that threat this week.
Another person said that Stephen Miller, the president’s chief policy adviser and a supporter of curtailing legal and illegal immigration, did not support Mr. Vitiello’s nomination. The two people familiar with the president’s thinking both spoke on the condition of anonymity because they were not authorized to discuss the internal White House decisions.
The president’s abrupt decision came at a time when his administration considers the United States border with Mexico to be in crisis because of the flow of people trying to get into the country, making it a priority to have a confirmed appointee leading the agency to carry out the administration’s policies. But some senators, including Republicans, had concerns that Mr. Vitiello was not the right person for this job.
Mr. Trump, who has continued to push for stronger deportation rules, had also expressed concern about whether a career civil servant, like Mr. Vitiello, would be up to the task. ICE has been led by acting directors since January 2017.