The panel of three judges from the San Francisco-based 9th US Circuit Court of Appeals declined to block a lower-court ruling that suspended the ban and allowed previously barred travellers from seven predominantly Muslim nations to enter the US.
Moments after the court’s ruling, President Trump shouted on Twitter: “SEE YOU IN COURT, THE SECURITY OF OUR NATION IS AT STAKE!”
The tweet provoked a frenzied response on social media, with users mocking his statement and use of Twitter.
The former Democratic presidential candidate was succinct in her reply, choosing not to use caps, or indeed letters. “3-0,” she tweeted, an apparent reference the 3-0 vote by the court.
Mrs Clinton’s response split opinion on Twitter. While some praised her, others pointed to her two presidential campaign defeats.