Impeachment does not require a crime and Hamilton said as much.
See:
Op-Ed: Alexander Hamilton would have led the charge to oust Donald Trump
‘Trumpers will get their way and Trump will be exonerated.
‘But when the next president debases the constitution and abuses his office like Trump, they can look back today who they supported.
Unlike Trumpers if the next president is a democrat and acts like Trump and debases the constitution and abuses his office just like Trump, I will not be a good cultist like the Trumpist, but will stand up for what is right.
Going on the definition of high crimes and misdemeanors:
’The convention adopted “high crimes and misdemeanors” with little discussion. Most of the framers knew the phrase well. Since 1386, the English parliament had used “high crimes and misdemeanors” as one of the grounds to impeach officials of the crown. Officials accused of “high crimes and misdemeanors” were accused of offenses as varied as misappropriating government funds, appointing unfit subordinates, not prosecuting cases, not spending money allocated by Parliament, promoting themselves ahead of more deserving candidates, threatening a grand jury, disobeying an order from Parliament, arresting a man to keep him from running for Parliament, losing a ship by neglecting to moor it, helping “suppress petitions to the King to call a Parliament,” granting warrants without cause, and bribery. Some of these charges were crimes. Others were not. The one common denominator in all these accusations was that the official had somehow abused the power of his office and was unfit to serve.“
https://www.crf-usa.org/impeachment/high-crimes-and-misdemeanors.htm
Abuse of power , among other offense, were considered as impeachable.
The Trumpers puts Trump before the constitution like Putin is above his constitution. Two peas in a pod.