Japanese phrase
もともと賛成です。 mo to mo to san sei de su
Meaning
I have been in favor from the start.
When to use it
Says that the speaker has supported the idea from the start. It is a clear but calm way to correct an assumption of disagreement.
Example dialogue
この提案には反対ですよね？ ko no tei an ni wa han tai de su yo ne
You are against this proposal, right?
いいえ、もともと賛成です。 i i e mo to mo to san sei de su
No, I have been in favor from the start.