In an unusual exchange, pop star Lady Gaga on Sunday got into a Twitter feud with President Trump and members of his reelection campaign after they accused her of being anti-fracking.

Democratic challenger Joe Biden announced that Lady Gaga would appear with him Monday evening at a drive-in rally in Pennsylvania, a crucial battleground state.

Trump's team responded immediately, slamming the joint appearance.

"Nothing exposes Joe Biden's disdain for the forgotten working men and women of Pennsylvania like campaigning with anti-fracking activist Lady Gaga," campaign communications director Tim Murtaugh said in a statement posted on Twitter.

"This desperate effort to drum up enthusiasm for his lackluster candidacy is actually a sharp stick in the eye for 600,000 Pennsylvanians who work in the fracking industry," Murtaugh said, adding that Biden has "repeatedly promised left-wing activists" he will end fracking should he take office.

Trump was got involved in the dispute, posting on Twitter: “Just learned that Sleepy Joe Biden is campaigning in Pennsylvania with Lady Gaga, a proud member of 'Artists Against Fracking.' This is more proof that he would ban Fracking and skyrocket your energy prices.”

Lady Gaga, who has 82.4 million followers, shot back at Murtaugh. "HEY TIM HEY @realDonaldTrump SO HAPPY IM GLAD TO BE LIVING RENT FREE in your HEAD. #BidenHarris."

Lady Gaga additionally posted another tweet: “I'm voting for America.”

Lady Gaga's political opinions are no secret. She previously supported Biden in a video and is an LGBTQ rights advocate. The 34-year-old is among the most popular musicians of the past decade, selling well over 125 million records.

Trump and his campaign have consistently argued that Biden would end fracking if elected, a move they say would hurt voters in states such as Pennsylvania. Biden has firmly denied he would ban fracking but would only ban new gas and oil permits on federal land.