You only need enough to convict. BTW, a false narrative or political agenda isn't evidence, it's propaganda.
Talking about a "false narrative" in relation to Trump and calling the Brief submitted accusing Trump of various acts so is highly amusing.
Lets us discuss the truly false narrative that Trump pushed after the November Presidential Election that the Election was stolen. How Trump pushed and pushed that obvious lie and made repeatedly false accusations about this that and the other related to the Election. Shall we talk about Trump's efforts, post-election to delay etc., completion and certification of the results of the Election. Shall we talk about Trump's repeated phone calls to pressure election officials, such has Election Officials in Georgia that resulted in an outpouring of death threats and what was Trump's response to that well said Official was again attacked by Trump.
Shall we mention that Trump before the Election was saying if he lost it could only be because the Election was rigged. Thus Trump had already in place some sort of plan to scream "Fire" when there was no fire. And even before the 2016 Election Trump was saying if he lost that it would only be because of fraud and after the 2016 Election Trump alleged that 3 million illegal votes were cast for Hillary. Trump had an investigation set up to find this alleged massive fraud and guess what they found nothing even remotely like massive Fraud in fact they found pretty close to zero. So the accusation of Election fraud by Trump has a well established history and so does Trump lying about it.
The above isn't simply simple Propaganda, it goes beyond it into outright lies. It is a false narrative deliberately created by Trump and his enablers.
On January 6th 2021 Trump continued to push his false narrative whipping up a crowd which then proceeded to storm the Capital. Trump told them the Election had been stolen, a lie, etc. And while it was happening Trump did very little to stop or contain it. And has of right now Trump continues to push the false narrative of a stolen Election, which imperils the future of American Democracy and certainly poisons the political landscape in the USA.
As for the Senate trial itself. Well... It is painfully obvious that unless something almost miraculous happens Trump will not be convicted. Why? Because most of the Republican Senators are spineless jellyfish who no matter what the evidence is will NEVER convict Trump of anything. To them the evidence does not matter, what matters is their fear of Trump and his supporters and their perception of their future political careers. Thus the Republicans will be tied to Trump and continue to push conspiracy lies and crap.
As for TDS, (Trump Derangement Syndrome). Do you honestly think that Trump's behavior since the November Election is remotely acceptable? Do you honestly think his grifting of his followers is acceptable? (Of hundreds of millions of Dollars!)
I find it amusing that you accuse the Brief of being a "false narrative", "propaganda", and having a "political agenda", while ignoring that Trump's campaign of lies etc., is all of those things.