For obstructing Congress' investigation into an whistleblower complaint that he pressured the president of Ukraine to "initiate or continue an investigation into the activities of former Vice President Joseph Biden and his son, Hunter Biden"

https://www.npr.org/2019/09/26/764071379/read-house-intel-re...

Of course it turns out hunter biden has been under criminal investigation for awhile.

But democratic controlled media and companies “fact checked it” so it was censored everywhere until election was over.