Today's McCain and Palin reunion comes just a few months after the senator was forced to defend his top 2008 campaign aides from criticism leveled at them in "Going Rogue," Palin's memoir.
McCain told Reuters in November, "I think it's just time to move on. There's been a lot of dust flying around in the last few days, and I just wanted to mention that I have the highest regard for Steve Schmidt and Nicolle Wallace and the rest of the team."
Following Friday's event in Tucson, McCain and Palin are scheduled to stump together Saturday at a 12:00 p.m. ET rally in Mesa, Ariz.
Palin then heads to Nevada to take aim at Senate Majority Leader Harry Reid, D-Nev. She's the featured speaker at a Tea Party Express rally in Reid's hometown of Search Light, Nev.
She then travels to Henderson, Nev., where she will appear at an event with conservative commentator Ann Coulter.
ABC News' Matt Loffman contributed to this report.