It's quite legal, in fact required by the President of the United States to put forth a nomination when a Supreme Court Justice Seat becomes vacant.
Despite what the left would have you believe, it is quite legal and Constitutionally neccessary.
That being said, The Dems would have you believe it is not very "nice."
So do some soul searching people.
When The Democrats are seeing their grasp on power slipping from their clammy hands, we must remember to be kind, understanding, docile, in the face of their attempts for domination.