impugn

verb2

1. •
   To verbally assault, especially to argue against an opinion, motive, or action; to question the truth or validity of; cast doubt on.

   • [The fact] that Americans’ trust in government is at historic lows […] makes it easier for politicians to impugn the system – courts, parties, and institutions. — 2023
2. •
   (no longer used) To assault, attack.