WASHINGTON (AP) — The surge in immigrant children caught crossing the southern border in Texas that has dominated headlines and risks becoming a political crisis for President Barack Obama and Congress includes a new threat facing Border Patrol agents: reporters.

An assistant chief patrol agent, Eligio “Lee” Pena, warned more than 3,000 Border Patrol agents that journalists looking for information about what Obama has described as a humanitarian crisis are likely to ask for information and “may try to disguise themselves.” The email, obtained by The Associated Press, said agents should not speak to reporters, on or off duty, without advanced permission and warned that anyone who does could be charged with a crime or disciplined administratively.