The GOP candidate's push comes amid calls for a third-party candidate on the right.
Julian Hattem 05/05/16 03:47 PM EDT
“We don’t have any reason to believe that it might be true."
The convention will be in the former Speaker's home state of Ohio.
“He’s a risk America can’t afford,” the video says.
Duke called Trump's campaign "a great opportunity" for "European American" interests.
Trump "has no moral or ethical grounding," Sen. Chris Murphy said.
"He’s going to win if we see more of the good Trump and less of the bad Trump."
Trump also says he's had "really nice conversations" with Marco Rubio.
The New Mexico governor had been considered a potential Trump running mate.
The Senate minority leader showed he will be a vocal critic of the presumptive Republican nominee.