[AndyJackson]

Spencer said that if he receives official orders -- not in the form of a tweet

A tweet is a lawful. It is given my someone who has the authority to issue you orders, and it is to do a lawful thing in his power to order and your power to perform. If you want to send a note to SecDef asking if Trump meant it - meanwhile I am proceeding to act on it, then by all means do so. But you might get an invitation from the White House to get your lawful orders in person, and it could involve a cardboard box and the picture of your wife on your desk.

[Mark17]

and it could involve a cardboard box and the picture of your wife on your desk.

By sundown? 😁

[Bommer]

A tweet is not lawful and it’s not an order. You think Trump could mobilize troops with a tweet? He is correct and the orders are needed.

[Alberta's Child]

A tweet is a lawful. It is given my someone who has the authority to issue you orders, and it is to do a lawful thing in his power to order and your power to perform.

Sorry, but this is 100% bullsh!t.

From what I've read, there are 5-6 people in the White House who actually post Twitter messages as "Donald J. Trump."

Kellyanne Conway or Mick Mulvaney (for example) have no authority to issue orders to the U.S. Secretary of Defense through a stupid Twitter post.