A political party's nominee for an unexpired term must be nominated by the appropriate party convention if:

1. (1) the political party is making nominations by convention for the general election in which the vacancy is to be filled; and
2. (2) the vacancy occurs on or before the fourth day before the date the convention convenes.

Acts 1985, 69th Leg., ch. 211, Sec. 1, eff. Jan. 1, 1986.