Lady Gaga is firing back at President TrumpDonald TrumpCIA chief threatened to resign over push to install Trump loyalist as deputy: report Azar in departure letter says Capitol riot threatens to 'tarnish' administration's accomplishments Justice Dept. argues Trump should get immunity from rape accuser's lawsuit MORE after he tied her alleged stance on fracking to her support of Joe BidenJoe BidenAzar in departure letter says Capitol riot threatens to 'tarnish' administration's accomplishments House Democrats introduce measures to oppose Trump's bomb sale to Saudis On The Money: Retail sales drop in latest sign of weakening economy | Fast-food workers strike for minimum wage | US officials raise concerns over Mexico's handling of energy permits MORE.

The 34-year-old "Rain on Me" singer is poised to campaign with the Democratic presidential nominee in swing-state Pennsylvania on Monday, joining him at a drive-in rally in Pittsburgh. She released a series of videos and social media posts in recent days voicing her support for the former vice president.

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Trump took notice, tweeting early Monday morning:

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The performer, born Stefani Germanotta, responded to an earlier statement from Trump campaign communications director Tim Murtaugh that dubbed her an "anti-fracking activist" and knocked Biden as prioritizing "the desires of the liberal Hollywood elite and the radical left."

Gaga was reportedly part of a group called Artists Against Fracking founded by Yoko Ono in 2012.

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 insisted he would not ban all fracking. The ex-VP has proposed banning new gas and oil permits on federal land, which only accounts for a small percentage of the industry.