US border patrol chief has left the agency

US Border Patrol Chief Mark Morgan, a former longtime FBI agent, has left the agency, a source familiar with his departure told Reuters on Thursday.

The reason for his departure was not immediately clear, and a statement provided by acting commissioner Kevin K. McAleenan didn't provide any details.

"I want to thank Mark Morgan for his unwavering dedication to our border security mission, and recognize his life-long career in service to the nation," McAleenan said in the statement.

Morgan's departure comes a day after President Donald Trump signed executive orders directing the construction of a wall along the Mexican border and the hiring of 5,000 additional border patrol agents.