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He has no control over the tariffs charged by Germany, so that's nothing against him (or any PotUS).
However, if he went to Germany and said, "They spoke powerfully and bigly and I don't not want to disagree with them but there are lots of other countries anyway and so they're right they should raise their tariffs and I am going to block the US from looking into it or lodging a WTO complaint and fire anyone who tries" or something like that, then that might be. Of course, he'd never do anything even vaguely like that, right? Right...
Again, I started my first comment by saying he hasn't yet done anything to warrant such a charge, but he's headed awfully close to that direction. He didn't misspeak in Helsinki - he got caught out saying what he really thought. He love Putin - has done for years and so long as Putin whispers nice things to him, that's all he cares about - not the US.
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That also doesn't make any sense. President's do all sorts of favors for foreign countries and leaders - both allies and potential adversaries. Recently, Trump helped President Xi of China out by helping out the Chinese company that was going broke. But that's not treason. The President I'm sure is putting that on his list of favors that Xi now owes him down the road. Trump cancelled military exercises with South Korea as a favor to Kim of North Korea. That weakens our military prowess against a country that we could be at war with and who's threatened us with nuclear attack. Is that treason? Of course not. He's trying to prevent a war by making peaceful overtures. If Trump doesn't want to press the Russians about their breakin of DNC emails because he wants to move forward in our relations with them becasue he consider them more important, that's not treason either. Reminder that we're not at war with any of these countries.
Here's Congressional law regarding the definition and penalty for treason against the US.
United States Code at 18 U.S.C. § 2381 states:
Whoever, owing allegiance to the United States, levies war against them or adheres to their enemies, giving them aid and comfort within the United States or elsewhere, is guilty of treason and shall suffer death, or shall be imprisoned not less than five years and fined under this title but not less than $10,000; and shall be incapable of holding any office under the United States.
https://en.wikipedia.org/wiki/Treason#United_StatesSome definitions of the above:
ADHERING. Cleaving to, or joining; as, adhering to the enemies of the United States.
2. The constitution of the United States, art. 3, s 3, defines treason against the United States, to consist only in levying war against them or in adhering to their enemies, giving them aid and comfort.
3. The fact that a citizen is cruising in an enemy's ship, with a design to capture or destroy American ships, would be an adhering to the enemies of the United States. 4 State Tr. 328 ; Salk. 634; 2 Gilb. Ev. by Lofft, 798.
4. If war be actually levied, that is, a body of men be actually assembled for the purpose of effecting by force atreasonable enterprise, all those who perform any part, however minute, or however remote from the scene of action, and who are leagued in the general conspiracy are to be considered as traitors. 4 Cranch. 126.
https://legal-dictionary.thefreedictionary.com/adhering