Sen. Kirk said his split with Donald Trump "pretty clearly demonstrated" his independence.
The GOP senator still holds a cash advantage.
The campaign uses animated GIFs from the movie "Zoolander."
Senators cited conflicting schedules in missing Thursday's talk with Trump.
The Senate will take a procedural vote on Toomey's legislation this week.
The ad will run for two weeks in Ohio starting on Wednesday.
Sen. Joni Ernst is considered a potential Trump VP pick.
Clinton said she was "eager" to speak to authorities.
Trump has promised a lively convention that will stand out from past events.
Sen. Kelly Ayotte said she is "disappointed" Lynch has refused to formally recuse herself.