Trump could be impeached again.
"High crimes and misdemeanors" isn't a legal definition / requirement for behaviour to fit a specific crime (and conversely guilt for a specific crime may not be grounds for impeachment).
Trump's deliberate and well-documented (Woodward tapes) "malicious" lies and instructions to "open up" despite prior but near simultaneously demonstrating he had knowledge about the seriousness of the pandemic while knowing that the consequences of doing so would result in unnecessary deaths of hundreds of thousands of US citizens. But he did it anyway.


