arguments for why they need access to trump's tax returns to conduct their investigations. treasury secretary steve mnuchkin whose department oversees the irs will decide whether to grant the committee's request. and if mnuchkin denies this request it would really be unprecedented and the first time in history that this section of the tax code which allows ways and means to obtain any american's tax information is challenged in court. democrats think they have a strong legal standing, but they are worried about the process getting drawn out in court. >> let me ask you about the president's inner circle. what are you hearing about democrats plans to intensify the focus on folks and people like his daughter, ivanka trump, don trump jr., son-in-law jared kushner. none of them have been called in front of the mueller probe. any chance we'll see them in front of capitol hill? >> reporter: even.