"I hope Secretary Clinton is perfectly healthy," he said.
Rep. Tim Murphy (R-Pa.) said parts of Clinton's plan are "very helpful."
"Trump has severe attention problems and simply cannot take in complex information."
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 that in last week's poll.