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My opinions follow:
Nancy Pelosi has done her homework on Trump, as has all the world leaders. They all certainly understand his narcissism and his need for winning and accolades, two traits of narcissism. I'm sure she has also consulted with some of the best psychologists in understanding Trump.
Mayo Clinic: Narcissistic personality disorder
"Narcissistic personality disorder — one of several types of personality disorders — is a mental condition in which people have an inflated sense of their own importance, a deep need for excessive attention and admiration, troubled relationships, and a lack of empathy for others. But behind this mask of extreme confidence lies a fragile self-esteem that's vulnerable to the slightest criticism."
World leaders have tried to either 1) indulge Trump's narcissism and give him what he wants, hoping to get something in return, or 2) confront him (e.g. Trudeau in Canada). Neither has worked because Trump himself has no understanding of what it takes to negotiate with adversaries other than to bully them into submission. He has no vision of how to negotiate the complexities of America's place in the world. That's because his only focus is on his self...his ego.
Nancy Pelosi fully understands this and will not indulge Trump on his terms. Rather I see her filling the role of a shrewd politician who will attack his "fragile self-esteem" and goad him into making irrational remarks that will undermine his base. He survives because his base remains steadfastly loyal to him. Nancy is going after that. From the Forbes article:
"While saying yes to border security and yes to immigration reform, she’s very clear that Trump can’t have his wall. No means no. The wall is, as she says, an “immorality.” She’s even said that demands for the wall are “like a manhood thing with him — as if manhood can be associated with him.” But he refuses to accept her no. There’s to be no compromise. Why? Well, he can’t agree to open the government because, as he’s been quoted saying, “I would look foolish if I did that.” He comes first, before country or even party. Rather than looking for an agreement he’s governing like a pathological narcissist, as well as being someone who does indeed have a self-described and documented history of being a sexual predator. That should not be forgotten. Character is everything."
Nancy Pelosi must continue to say no to the wall and erode GOP support for the wall and his base. She will pass piecemeal legislation in the House to chip away at the Republican support for the wall. And when she ultimately wins, she will attack his manhood again and again, rendering him impotent in the eyes of his base. She views Donald Trump for what he is -- an imposter who is dangerous on the world stage and has to be neutralized before he can do more damage in the next two years. In effect she wants to make him a scorned lame duck president without real power for the next two years.
That's my opinion subject to disagreement. She is shrewd and playing the long game...