Haslam became the first prominent Tennessee Republican to make such a statement when he issued his comments Sunday afternoon.
He joins a growing number of national Republicans who are calling on trump to stand down in light of a 2005 video where Trump made vulgar comments towards women.
“I want to emphasize that character in our leaders does matter. None of us in elected office are perfect, but the decisions that are made in the Oval Office have too many consequences to ignore the behavior we have seen,” Haslam said.
“It is time for the good of the nation and the Republican Party for Donald Trump to step aside and let Gov. Mike Pence assume the role as the party’s nominee. If he does not step aside, I will write in a Republican for the office of President.”
Haslam never endorsed Trump, one of the only prominent Tennessee Republicans not to do so.
When asked recently about Trump, Haslam said just wanted the election season to be over.
“Finally, I want to urge Republicans to vote. Now more than ever, who we elect to Congress and our state and local offices is critical to the future of this country and state that we love,” Haslam said in the statement.