Democratic presidential nominee Hillary Clinton used Twitter slang to ridicule Republican presidential nominee Donald Trump on Thursday, telling him to ‘Delete your account,’ during a heated social media exchange between the two campaigns.

Clinton’s demand arrived just minutes after Trump sent a tweet notifying his followers that President Barack Obama had officially endorsed her, referring to her as “Crooked Hillary.”

The tweet “delete your account” is understood as a dismissive sneer, and is usually used to ridicule other people’s messages in social-media conversations. By sending the message, Clinton was likely trying to ridicule Trump’s very successful use of Twitter.

Social media reacted to the exchange:

According to Clinton’s director of social media, Alex Wall, her tweet to Trump was “the most retweeted tweet of the campaign!” The tweet has so far received over 260,000 retweets. Trump’s initial tweet about Clinton received 21,000 retweets.

Clinton’s tweet also prompted criticism because of the current investigation she is under, about deleting sensitive government emails she sent from a private email account while she served as secretary of state.

Follow Adelle Nazarian on Twitter @AdelleNaz