President Donald Trump attacked Rep. Maxine Waters as 'low IQ' in a freewheeling Saturday night speech, and the longtime Democratic lawmaker responded by saying porn star Stormy Daniels may do him in.

Trump went after the California Democrat, who has regularly called for his impeachment, at a racaus Saturday night rally in Pennsylvania.

'And Maxine Waters – a very low IQ individual. Did you ever see her?' Trump told the crowd of cheering supporters.

''We will impeach him. We will impeach the president. But he hasn't done anything wrong. It doesn't matter, we will impeach him,'' Trump said, mocking Waters' calls for his own impeachment.

'She's a low IQ individual. She can't help it. She really is. "We will impeach him." But we have Maxine Waters and plenty of others,' Trump said at a rally for House candidate Rick Saccone, who is facing a tough race in a special election, where he also went after members of the media and Oprah Winfrey.

If for 'some reason, Mueller does not get him, Stormy will,' Rep. Waters responded, bringing up porn star Stormy Daniels, who is suing Trump

Waters – who called it racist when Trump issued an earlier attack on the black caucus member – hit back in an interview on MSNBC Sunday.

'He is expert at name-calling,' she said, ripping the president as a 'con man,' and pointing to his other attacks on Oprah Winfrey, House minority leader Nancy Pelosi, and Sen. Elizabeth Warren.

'It seems that he's identifying and picking up more and more women that he's attacking.'

Then she brought up porn star Stormy Daniels, who is suing Trump and claiming a non-disclosure agreement she reached with Trump lawyer Michael Cohen is invalid. She got a $130,000 payment days before Election Day in 2016. Her lawyer says she had a sexual affair with Trump.

'This business about Stormy is not going to go away. He can call us all the names that he's going to call us,' Waters continued, calling into MSNBC's 'AM Joy' with Joy Reid.

Trump went after Waters, NBC's Chuck Todd, Nancy Pelosi, and Oprah Winfrey at his Saturday night rally in Pennsylvania

Donald Trump and porn Stormy Daniels aka Stephanie Clifford pose together in 2006; the White House says he already won a case in arbitration against her and that he's denied the accusations of an affair

Adult film actress/director Stormy Daniels hosts a Super Bowl party at Sapphire Las Vegas Gentlemen's Club on February 4, 2018 in Las Vegas, Nevada

Last year, Mueller (seen above in 2008) was appointed as special counsel to investigate alleged Russian meddling in the 2016 election

'This is what this con man does. He diverts attention from himself by attacking others,' before bringing up special counsel Robert Mueller.

'Stormy is not going away. She said 'for if some reason, Mueller does not get him, Stormy will,' she predicted.

Trump previously went after Waters during a joke-filled speech at the Gridiron dinner earlier this month, when he said she needs to take an IQ test.

I certainly expected him to come out with some racist remarks about me,' she said. 'So he did exactly what I expected him to do. And, by the way, I'm told he wasn't funny at all,' she told MSNBC afterward.

'Con man Don is gonna keep it up ... He comes for me, I'm coming for him,' Waters said

She continued Sunday: 'I'm not intimidated by him, she said. And so he can keep calling names. I've got plenty for him. In fact, everybody knows he's a con man. He's been a con man all of his life.'

Waters added: 'Con man Don is gonna keep it up ... He comes for me, I'm coming for him.'

Waters has repeatedly called for Trump's impeachment, even as party leaders urge rank and file members to tamp down the talk.

'I say it is time to get ready for impeachment,' Waters told her state party in February. 'I cannot wait and I'm counting on special counsel Mueller to connect the dots.'