The super-PAC allegedly promised access to a President Trump.
The vulnerable GOP senator has called on Deborah Ross to release parts of her tax returns.
Trump received the insurance payout after several storms near his Palm Beach, Fla., resort.
The group is spending an additional nearly $2 million to help Pat Toomey.
The CNN/ORC poll comes just about two weeks ahead of the general election.
"Remember we’re going to vote for different people," the singer says.
Trump used the WSJ report to label Clinton as corrupt at a Monday rally.
The vice president knocked the press for covering Trump's comments over policy proposals.
Issa said Obama "continues to deny accountability."
"Some of you might be aware that Michelle does not really love politics," he said.