Whether a reasonable ambiguity in a cooperation or plea agreement necessarily defeats a defendant's claim of breach on plain error review, or whether the court of appeals should first consider the principle that such agreements are construed against the government as the drafter?

QUESTION PRESENTED Whether a reasonable ambiguity in a cooperation or plea agreement necessarily defeats a defendant’s claim of breach on plain error review, or whether the court of appeals should first consider the principle that such agreements are construed against the government as the drafter? i