@blatham,
No that is a specious question.
The demand for an FBI investigation is an obvious ploy to delay the vote. There is no reason why Kavanaugh should join it.
Let the accuser come forward and make her case. If she offers up credible evidence or claims that can be investigated and FBI investigation might be appropriate. Right now there is nothing to investigate. Every person she has identified as a possible "witness" has denied it happened, however I'm quite sure that before this is all over the Dems will "find" someone willing to testify that they were in the room and watched Kavanaugh attack this woman, and they will probably also "find" at least one other woman who will be willing to level a similar vague charge.
It's disgustingly obvious what is going on here, and I can only hope the American people see it for what it is.