>>/24214/
> CHAIRMAN of the Senate Judiciary Committee
> who replaces him, if removed?

Rule XXIV

4. When a chairman of a committee shall resign or cease to serve on  a  committee,  action  by  the  Senate  to  fill  the  vacancy  in  such  committee,  unless  specially  otherwise  ordered,  shall  be  only  to  fill  up  the  number  of  members  of  the  committee,  and  the  election  of  a new chairman.

https://www.govinfo.gov/content/pkg/CDOC-113sdoc18/pdf/CDOC-113sdoc18.pdf#page=24