I know this cum...tum construction to be one of his favorites, but this has got to be ablative. Not sure of the sense anyway.coniunctione frangi senatus opes, diiunctione civile bellum excitari videbam, atque utebar familiarissime Caesare, Pompeium faciebam plurimi, sed erat meum consilium cum fidele Pompeio, tum salutare utrique.