I believe "considers" is understood to be a process of some duration, having a beginning and an end. (Of course, we may say they are still considering.) If on Monday they are not considering it, and on Tuesday they are, then Tuesday is when it started.
You'll have to copy this messy paper over again before I read it. It's not necessary to say "before I start reading it."
Re. your second question, In my opinion, "then" is understood, and it's presence would not help to clarify the sentence, nor would it make any difference in the meaning or the sense. It is therefore better omitted. As far as first- and second-class conditionals are concerned, I'm like GG.
- A.
Edit. Re. "considering," sometimes in formal talks we say an item for consideration is "still on the table," meaning it may not be currently under discussion, but it's still an "open" topic. In you example, Washington is refusing to "put the FTA on the table," or "bring it to the table." i.e., consideration itself becomes a bargaining chip. "We may never ratify FTA, but if you don't let our beef come in without restrictions, we won't even consider FTA."