Trump said he hadn't campaigned to win the popular vote, but asserted that he would have won had his campaign employed a different strategy.
Sisolak, a Democrat who was elected to office in November, rejected AB186, which would have joined a pact of several states looking to disregard the Electoral College in the next presidential election.
A new poll showed a slight majority of Republicans think voter fraud is such a problem they would support pushing back the next election if the president and Congress backed it.
The vice-chair of Trump's voter fraud panel wants to make voters prove their citizenship when registering, despite little evidence of voting by illegal immigrants.
Crowd size, the popular vote and voter fraud continue to get under Trump's thin skin.
Richard Dowling and Cormac Gollogly are the first gay couple to marry in Ireland.