Hillary Clinton made a surprise visit to a union protest outside Donald Trump’s Las Vegas hotel Monday, urging those picketing the property to just say no to the Republican front-runner.

“You have to say no to efforts that prevent you from organizing, that prevent you from having the kind of working conditions you deserve,” the Democratic front-runner said to hundreds of protesters from Culinary Union Local 226 who had gathered outside the Trump International Hotel, according to the Los Angeles Times. “That means saying no to Donald Trump.”

Clinton was in Las Vegas to participate in the first Democratic presidential debate on Tuesday at the Wynn Hotel, right across the Vegas Strip from Trump’s property. Union workers had planned the march in front of the hotel for days, hoping to organize its workers. But Clinton’s surprise appearance quickly morphed the meeting into a campaign rally.

#share#Speaking to the union members, many of whom were Hispanic, Clinton decried Trump’s anti-immigrant rhetoric as well as those who found it entertaining. “I don’t think it’s entertaining when somebody insults immigrants, insults women,” she said, to cheers and applause. “If you are going to run for president, then you should represent all the people of the United States.”

#related#Clinton’s attack on Donald Trump may shed light on her debate strategy Tuesday. Despite hemorrhaging support throughout the summer and failing to stunt Vermont senator Bernie Sanders’s meteoric rise in Iowa and New Hampshire, Clinton rarely acknowledges any of her Democratic challengers directly.

She prefers instead to zero in on the sins of Republicans — specifically Trump. By singling him out on the eve of the Democratic debate, Clinton signaled that she could continue that strategy Tuesday night.