A letter to the editor in today’s Dallas Morning News asks a pertinent question of Sen. John Cornyn, the Texas Republican who declared there to be an enormous inflow of illegal immigrants streaming across the border onto land owned by a friend of his.

The letter writer asks why, if it’s such a huge national security breach, didn’t the senator notify the feds immediately instead of posting it on Twitter.

Cornyn says his pal — who he declines to identify — is watching 300 illegal immigrants come onto his land daily. Local police officials say it isn’t happening. Who’s telling the truth?

My hunch is that if really was occurring along the Rio Grande River, Cornyn — himself a former trial judge, state Supreme Court justice and Texas attorney general — would have fallen back on his judicial instincts and called the Justice Department right away.

Isn’t that what dedicated public servants do?