For the sake of argument, let's say that in the 2020 elections Trump lost these 19 "Much more republican" states (according to this NY Times article) that he had easily won in 2016:
According to an excerpt of this NY Times article and Tuesday's debate, it's very clear that Trump has been recently pushing to discredit the election:
President Trump’s angry insistence in the last minutes of Tuesday’s debate that there was no way the presidential election could be conducted without fraud amounted to an extraordinary declaration by a sitting American president that he would try to throw any outcome into the courts, Congress or the streets if he was not re-elected.
This is an assumption, but Trump being Trump, he will not only try to discredit the elections of all these states but he will also want to win by a huge margin (he said he wanted to win 9-0 if it went to the Supreme Court).
My question: what process would he need to go through to discredit the votes of the 19 "Much more republican" states that he had won in 2016 but lost in 2020?
In this closed question, a user mentioned that he needs to file a lawsuit in "state or federal court with jurisdiction over the state in which an irregularity was alleged". Would this be his first step of would another "entity" need to verify that his complaint merits a lawsuit?
For example, at the debate he said he found ballots in a river. Can he file a state-level lawsuit saying that there's fraud or a miscount because someone found ballots in a river? He also said that he would send his followers to the voting booths, and one of these guys says that he "saw" fraud taking place. Is that enough for a lawsuit?
And how long would all of this take? Trump being Trump, I assume he'll try to drag out as long as humanly possible.