No, there is no "crippling hit" to Trump's credibility.   It exists only in the imaginations of the Fake News, who are out-of-touch and completely disconnected from the average person.

Apparently, the Fake News believes that it was a crime for the Trump campaign to dig up dirt on Crooked Hillary.  In fact, the Fake News believes it was a crime that Trump won the election. They just can't get over Crooked Hillary's devastating and historic loss.

The truth is that Trump is a great President working hard on delivering on his campaign promises.   Trump has not lost any credibility whatsoever.  The only ones taking "crippling hits" to their credibility are the Fake News.