The more one investigates this impeachment the more it seems that they are just looking to overturn an election result they didn't like.
There is no precedent for this.
The more one investigates this impeachment, the more it seems that Trump and his administration have gone competely rogue. Shaking down the Ukrainian President to investigate the Bidens, asking security services in Europe to provide evidence that Russia did not hack the DNC, hiding the evidence of this and other politically embarassing interactions with foreign leaders.
No country will currently negotiate with Donald Trump because he's an unreliable negotiator, and he's not always acting in good faith.
The entire Trump White House has gone rogue. They are only acting in Trump's interests, not the interests of the nation. William Barr is chasing Trump's conspiracy theories all over Europe. Trump has amply demonstrated that he's too weak to get elected without illegal assistance, falsely smearing an opponent, and using the power of his office to bully and intimidate both the press, other elected officials, and whistleblowers. All of the growns have left the Administration so the guardrails are all gone. This is a White House in total melt down, thrashing about for a defence they can sell to the American public, and just making things worse for themselves at every turn.
Trump is throwing accusations of "treason" around when nothing that is happening could possible meet the definitintion of "treason" in the Constitution. The Founders were very leery of charges of "treason" and for that reason defined "treason" in very narrowly. That's because the Founders were accused of "treason" against their government when they declared independence from England, and many of their numbers were executed for treason in revolting against an unjust government.
It is impossible for the whistleblower, Adam Schiff, the press, any leaker or any other American making an accusation of illegal behaviour by a member of his own government, to be guilty of treason. Trump is threatening all of those pursuing this impeachment with violence. Trump has said he's trying to find out who the whistleblower is and has suggested he should be executed. This could be considered to be another abuse of power and witness intimmidation, just as Trump's tweets to Michael Cohen could lead to charges of witness intimmidation when Trump leaves office.