I think Pelosi is correct here. At least I know I have never seen a president so demonstrably insecure as Donald Trump. Most of his detractors are focused on the "dig into Biden" request. But the "prove Ukraine, not Russia, interfered in the 2016 election" is more revealing of his character, IMHO.
I believe that, because the administration's effort to promote and support this conspiracy theory does seem based in massive insecurity on Trump's part, meaning, he simply cannot tolerate the proposal that his 2016 victory was tainted because of Russia trying to help him win. I mean, three years later, he still harks back to the 2016 election, and how even losing the popular vote had to be the result of election fraud.
In short, this guy has a massive, massive problem where insecurity is concerned. The bully who is president is a small and weak man, at heart. Ever known a bully who was not, at heart, weak and cowardly? That has always been my bottom line analysis. That weakness and insecurity in the person of a hate mongering demagogue is who we made our president. I don't know how his supporters can so fiercely defend such a weakling.....