Chris Christie, the chairman of Trump's transition team, will host the event in New Jersey.
Jason Miller clarified Trump would build a "physical wall."
"If Mrs. Clinton wins, it could prove a target for her political adversaries," it said.
“I know who I am, and it got me here,” Trump said.
"There is no place for this in the Republican Party or our country."
Her lead is down slightly from last week's poll.
Reports surfaced earlier this week that Trump may be talking about building a "virtual wall."
OPINION | With her rhetoric, Clinton may have legitimized the movement.
Rep. Cresent Hardy's office says he's expected to return to Washington next week.
Democrat Ted Strickland is trying to unseat GOP Sen. Rob Portman.