A Republican super PAC is spending nearly $1 million on the open seat.
"It's better to write your plan in pencil," the freshman GOP senator says.
Rob Portman says the Senate "should look at justices on the merits."
Neither Ryan nor McConnell have commented on Trump's doubts about the election results.
Trump called Clinton a "nasty woman" during the final debate.
Cruz declined to comment on Trump's claim that the elections are "rigged."
She tells Trump the election isn't "rigged" in a Twitter rant.
Warren said Trump's argument "didn't spring from nowhere."
"If that new president happens to be Hillary we can't just simply stonewall," Sen. Grassley said.
Sen. Charles Schumer (D-N.Y.) stopped short of calling Donald Trump a racist in an interview Tuesday, but said the Republican nominee is using bigotry to help his campaign.
"He is totally tone-deaf to what is racism,...