Priebus talked up his party's nominee and slammed Democratic rival Hillary Clinton.
"We're in a battle for freedom in this country. Donald Trump is going to help protect our country," Priebus told a boisterous Erie, Pennsylvania crowd. "Look at the choice we've got. Hillary Clinton has a problem with lying. She lied. She lied. And she lied over and over and over again."
Such appearances by a party chair are not unusual in a presidential campaign, but this one stands out in an election cycle with Trump lagging behind Clinton in a swath of polls, particularly in key electoral states. That's led to tension between the Trump campaign and RNC officials over strategies and tactics.
Priebus spoke to Trump
about the direction of his campaign and his impact on down-ballot races, sources told CNN on Thursday. The two are already in regular contact and this particular conversation was described to CNN as not confrontational -- as a Time Magazine piece suggested Thursday -- but rather as a broad overview of the state of the race and the ramifications of Trump's freewheeling style.
At Friday's rally Priebus focused on issues touted by Trump and his running mate, Indiana Gov. Mike Pence.
"Here's the difference: Donald Trump and Mike Pence will tell the truth. They'll protect your Second Amendment rights. They'll protect our southern border."
Once on stage Trump praised Priebus for the RNC's efforts working with his campaign -- and talked up his own accomplishments in securing the GOP nomination.
"We're raising money for Reince and for the RNC," Trump said. "I'm putting a lot of money up. I funded my primaries, and I spent less than anybody else."
Trump also slammed Clinton over her claims that as a senator from New York she helped create jobs in economically depressed Upstate areas.
"She got elected -- she did nothing," Trump said. "The only ones that benefited were the consultants and the people that helped her out."
He then pivoted to a broader critique of her trade policies.
"She is going to renegotiate trade deals the same way she was going to put 200,000 jobs in Upstate New York," he said.