I believe you are mistaken. Once Harris assumes the presidency, the VP office is vacant, right? As the prez, she can no longer cast the 51st vote in the Senate. IOW, the democrats do not have the tie-breaking vote in the Senate anymore, and it becomes 50-50. Which means the democrats do not have a simple majority in the Senate; they got 50 but they need 51. Therefore, I highly doubt the democrats will use the 25th Amendment to remove Biden, cuz that means they can't confirm federal judges or Supreme Court justices. If they lose control of the Senate in November, then I could see Biden resigning for health reasons and Harris becomes the prez. But here again, the Dems have to have 51 votes to confirm her VP which they won't have.
Thats a valid point worth thinking over, in this situation it would likely be up to the Senate Parliamentarian to say how the government moves forward on the issue. We have to have the office of VP filled, and with an evenly split hyper partisan senate they would likely deadlock on any selection she made... I wonder if there are some arcane senate rules or unwritten codes of action that set a precedent that could be used to end the stalemate. If not, the number three person on the list would be Pelosi so its possible she would move to that slot giving her an easy exit so she doesn't have an ugly race to hold onto her speakership. So think of a possible Harris in the White house, Pelosi as VP and tie breaker in the Senate, and then Jayapal, Sanders or Cortez as House speaker.
We are headed towards a constitutional crisis at the same time as our world is inching closer to WW3. I do not think Russia or China will wait for our country to move through all of this. China wants Taiwan and all of the South China Sea and perhaps more and Putin wants all of the old Soviet Union back. Joe is to old and feeble to stand up to this and Harris too much of a lightweight to make a difference. And quite frankly Sanders is carrying a lot of weight on the blue side and he would do happy dances if the old soviet union borders returned. If China and Russia move they will likely go at the same time. When that happens look for Iran to try to make good on their promise to drive Israel into the sea and then for NK to drive in to South Kora. Meanwhile Algeria is talking about war with Morocco which has been our longest ally since we became a nation and they have a strong relationship with Israel.. Algeria is aligned with Iran, and Libya is still unstable with Islamic warlords chomping at the bit for any excuse to fight, so that conflagration would likely consume the entire top half of Africa which supplies the bulk of the oil to Europe. So unless any major war lasts less than a few weeks, the EU will not have the resources to defend themselves and we can no longer even supply ourselves since Biden shut off much of our production on his first day of office to appease Cortez. Our southern border has been invaded by millions of people, people we have no clue who they are or who they really support, and we have active marxist chapters in our country who have proven they can and will launch coordinated destructive violence across our country.
Meanwhile back at the office we have a doddering old man who can't remember what sentence he is reading on his teleprompter, a light weight VP who was an affirmative action pick who can't get through a friendly tv interview without a half dozen gaffs and a 50/50 government tearing the heart out of our country. with an entire group of congresswomen who have shown they are not supportive of western civilization.
In 1940 we had slow ships, propeller airplanes, thousands of miles of open ocean, and we used flags and spot lights to communicate between ships, and we had a population of hard men who could fight and work nonstop This time around firm hard decisions will have to be made in minutes, maybe seconds, and there won't be time for second guessing or worrying about hurting someones feelings. And much of our military is led by people who were selected because of what boxes they could check off and not how proficient they were in the arts of war.
And tonight when you turn off all the lights and lay down, try to remember that empty grin and vacuous eyes on Bidens face. The brain behind that empty stare is what we have in place to to lead the free worlds responses. Sleep well.