There were very good reasons to sound the alarm way before the details of the Ukrainian matter were exposed.
Trump should cooperate seriously with the congressional investigation.
Trump, who has never conformed to the customary way of doing things, now violates political protocol by placing personal interests above national interests...
Impeachment will be a political trial of the president, but also of the current abnormality in the U.S.
Impeaching Trump is not currently a goal in and of itself. The main concerns are who is going to be the next president and where the U.S. is headed.
Trump himself could have been the whistleblower, because impeachment is good for publicity.
Is Trump prepared to throw weak allies to the wolves to score political points domestically in the U.S.?
'It’s a thing called Article II,' he told a group of journalists on July 12. 'It gives me all of these rights at a level that nobody has ever seen before.'
The straw that is Ukraine has broken the camel’s back.
[I]f the political case against [Trump] advances, there will be no United States-Mexico–Canada Agreement.