Snopes describes how Stefanik broke House rules

But Schiff was correct, and the Republicans were wrong. Under the resolution passed by the House two weeks earlier, at that point in the proceedings the chair and the ranking minority member of the committee (i.e., Schiff and Nunes) could use their allotted 45 minutes to either yield to staff counsel or pose questions themselves, but not yield time to “whoever they wish[ed].”