As you pointed out, the impeachment process is constitutional and can be conducted for any reason including not having sex with staffers. Democrats proved they could also try to litigate a different result in a presidential election by trying to
recount votes in corrupt Broward County a number of times. Instead of getting out the big magnifying glasses to examine chads, Democrats have spent the last three years trying to come up with some sort of impeachment scenario. Weren't there some here who told us an impeachment would be coming once the Robert Swan Mueller III's report was out? That didn't happen so now Trump is guilty about trying to ascertain if the Bidens had done something wrong. It could have been coincidence that Biden's son was chosen as the best person in the world to man the Burisma board after all. If Trump had uncovered corruption, that wouldn't have only been good for him. It would have been good for the country. By Democratic rules, however, Trump was just supposed to go along with the corruption and not look into it; just write checks.
Those U.S. taxpayer checks to buoy the Ukranian government wouldn't of course been even necessary had the Obama administration not so badly bungled foreign policy in Ukraine by helping overthrow its elected government and inadvertently drawing Russia in. There was no constitutional basis for overthrowing Libya, Ukraine, and using ISIS to try to overthrow Assad either. If misusing cigars in the oral office and investigating corruption in Ukraine are worthy of impeachment proceedings, conducting unconstitutional wars and the millions of Russian dollars that went into the Clinton Family Foundation while Hillary was SOS were larger constitutional abridgments by orders of magnitude. Yet, Democrats hypocritically ignore that.
While China has deployed 18,000 miles of high speed trains and is creating weapons the U.S. has no answer for, Democrats are busy tying up our Country for four years trying to unseat our elected President like he was the head of Libya, Syria, or Libya. How would the Founding Fathers have ever guessed that any Americans would do that?