asking about his research and knowledge about this particular portion of the rio grande and its navigaability and then pointed to a study from 1975 to point out that during certain portions of the year the navigability of the rio grande is limited. but this witness was rapped by a question from the judge. the judge asking the witness directly what was the determination of this navigability from 1975? is the rio grande a navigable waterway? and this witness says yes, that this river is indeed a navigable u.s. waterway. now, the second witness is a state department adviser to the biden administration on u.s.-mexico relations. this witness testified that mexico has sent three diplomatic notes to the united states complaining about the border buoys and that these complaints and concerns have gone to the highest diplomatic levels including conversations with u.s. secretary of state antony