The Senate minority leader showed he will be a vocal critic of the presumptive Republican nominee.
Ted Strickland is hitting Sen. Rob Portman over a report that he could be Trump's running mate.
Sen. Richard Burr says he will support Trump as the nominee.
Democrats are tying vulnerable Senate incumbents to Trump after his win in Indiana.
The new web ad follows a $2 million TV and digital ad buy in Wisconsin earlier this week.
Ayotte faces a tough reelection fight to keep her Senate seat.
Young will face off with former Rep. Baron Hill in November for the open Senate seat.
The TV ad talks about her son's disability.
A top Koch network group launched ad buys in Wisconsin and Nevada.
Outside groups are using the recess to battle over the Supreme Court.