Trump’s lawyers are making the case, in great detail and supported by evidence, most of which isn’t really disputed, that the WI election was not conducted in accordance with Wisconsin statutes, and that votes were counted and certified that under WI law were unlawful. This is

... identical to the case the Texas makes in the Supreme Court. The result of this hearing will give SCOTUS proof of the allegations Texas is making.

Argues that an election held in violation of the Constitution is void and electors chosen in such an election cannot sit. Also argues that since the US Constitution ordains that the state legislatures select the means of appointing electors and since WI Election Commission didn’t

... follow those rules, the interests of other states are affected- foreshadowing the argument Trump’s lawyers will make in the Texas case in the Supreme Court.