National security expert Vicki Divoll says the newly-released "drone memo" on the legal reasoning for killing a US citizen by drone falls short, and it's time for Congress to act.

A Justice Department memo obtained by NBC News details the Obama administration's case for using drones to target and kill American citizens involved with terrorist organizations.

The Obama Administration is engaged in a worldwide dragnet of detention and death that raises troubling questions and fervent debate over the fight against terrorism.