Lady Gaga on Sunday slammed Melania Trump, after she said during a speech last week that combating cyberbullying would be a cornerstone of her work if she becomes first lady.

".@MELANIATRUMP to say u will stand for 'anti-bullying' is hypocrisy," Lady Gaga, who supports Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE, tweeted Sunday.

"Your husband is 1 of the most notorious bullies we have ever witnessed."

.@MELANIATRUMP to say u will stand for "anti-bullying" is hypocrisy. Your husband is 1 of the most notorious bullies we have ever witnessed. — #VoteHillary (@ladygaga) November 6, 2016

Trump spokeswoman Katrina Pierson responded to the singer soon after, using lyrics to one of Lady Gaga's own songs.

"After Tuesday, you'll call her #FLOTUS ." #JustDance it'll be OK," Pierson tweeted in response.

Melania Trump during a speech last week said American culture has become "too mean and too rough." As first lady, she said she would be an "advocate for women and for children."

“I do worry about all of our children. As we know, now social media is the centerpiece of our lives," she said.

“It can be a useful tool for connection and communication,” Trump continued. “But like anything that is powerful, it can have a bad side. We have seen this already.”