Why should they have to? These witnesses were subpoenaed. They should agree to appear without a court battle. If an ordinary citizen defied a court subpoena
You may have missed the bit about separation of powers, specifically the bit regarding executive privilege (which Trump is hardly the first to use). I've stated before, I don't believe Trump made the 'dont cooperate' command out of an effort to protect the office of the President, and I will acknowledge there is a chance of him doing so trying to protect himself from something being uncovered, but for the most part I think he's doing it to be a prick.
But the separation of powers is a real thing. Regular citizens subpoenaed don't have that, but Presidents do. The check-and-balance thing allows presidents to do things normal people can't, to prevent an over-reach by congress just as congress has a means to prevent an over-reach by presidents. In either situation, it goes to the judicial branch to determine what should be done. A president should be able to conduct national business with other world leaders - it's been going on since we had our first president. With that duty, there is lattitude given to the office in doing negotiations, and there are boundaries on those negotiations as overseen by congress. I can get into it further if you wish, but I'm trying not to set off a TLB;DR. Bottom line, all presidents have had the 'separation' from the legislative and judicial branches. IF the courts say the president's men have to appear despite executive direction, it will weaken the office for all future presidents (something the Dems don't seem to notice or care about).
My point, regardless of Trumps motivation (be a prick, hide something, etc), there is a real concern about giving too much power to any single branch. Historically, presidents have had this power, and it is up to the judicial, not legislative, to determine if this situation is different.
You say the dems have been out to get him for 3yrs, trying one thing after another but I say that Trumps actions over those 3yrs have brought us here.
Right, because Trump colluded with Russia...oh, wait, he didn't. We have Mueller's report saying so. Because Trump quid-pro-quo'd...er, bribed....er, what is now? Fuck, can't even make up charge that can stick because there isn't something he did wrong...we'll just keep looking for something to impeach him with - let's dig into his previous taxes, maybe that'll turn something up. Investigating his staff was able to get some 'lying to congress', yeah, that was pretty dirty of Trump when he didn't have anything to do with it.
You say it has been Trump's actions. I look back and see a long list of Trump actions the Dems have pursued in an effort to impeach him. Even now, they are voting on something that is so unclear-cut there is great division amongst the people on if it was something wrong and if it is serious enough. I see 3y+ of Dems looking for something and failing repeatedly. If it were Trump's actions, he'd have been hung on something substantial long ago.
I don't even come into this thread to comment anymore because it is obvious that there are those who will believe whatever they want to believe. As long as Trumps supporters feel they can plausibly deny the obvious or make technical excuses they will because of their political slant. Ive seen enough and I don't have the time to waste my breath.
There are some who are blind, and they stick absolutely to their beliefs even in the face of inarguable evidence. I'd say that applies to both sides, and across a spectrum of how hard those beliefs are held. I think most of us in here are still listening to the other side, hoping to hear something that will change their mind, but with each growing day they find themselves without something strong enough to change their mind they become deeper entrenched with what they originally thought. Again, I say that of both sides, and even all of us in the middle
Still, we tune in, each express our differing views on the same 'facts', hoping to learn something.