Let me repeat:
If you obstructed congress
it is a crime. In fact it is a federal crime. It is not my opinion it is the law.
18 U.S. Code § 1505. Obstruction of proceedings before departments, agencies, and committees
https://www.law.cornell.edu/uscode/text/18/1505
Abusing his power would also include the laws he broke in furtherance of his attempt to cheat in the election. Which both the IG for intelligence and the GOA outlined when he violated the Impoundment and Control Act and covering up the whistleblower complaint. Remember his breaking the law by withholding the whistle blower complaint is how the country even found out about any of this in the first place.