evidence: At a campaign rally in Nevada, President Donald Trump on Saturday repeated unsubstantiated claims that mail-in ballots would contribute to widespread voter fraud in the November election. [...] Trump addressed a sea of supporters Saturday evening on the tarmac of Nevada's Minden-Tahoe Airport. Many of those gathered were not wearing masks or practicing social distancing despite the coronavirus pandemic. [...] Trump appears to face long odds in Nevada, which gave its six electoral votes to Hillary Clinton in 2016. His campaign is now hoping to score a backup route to victory if his luck fails to turn in other battleground states.