Clinton marches along anti-Trump protesters

US Democratic presidential contender Hillary Clinton has slammed GOP candidate Donald Trump for his stance on women and immigration during a surprise appearance at a labor protest against the billionaire.

The rally, organized by Culinary Workers Union, was held on Monday, outside the real-estate magnate’s  Trump International Hotel in Las Vegas.

"Some people think Trump is entertaining, but it is not entertaining to insult immigrants and women. That is just unacceptable behavior," Clinton told the 500-strong crowd of workers.

"If you are going to run for president, then represent all of the people of the United States," the former first lady added. "I wanted to come by to lend my voice to all yours and I wish you well in these efforts."

All five Democratic presidential candidates were invited to spend the evening before the first Democratic presidential debate at the rally, but only Clinton took the offer.

Clinton, sporting a red pantsuit that matched the crimson union shirt, then asked the workers to oppose Trump because he would keep them from enjoying the conditions they deserve.

"You have to say...'no' to efforts to prevent you from organizing, to prevent you from having the kind of working conditions you deserve, the kind of wages that are going to give you a living wage, and that means saying no to Donald Trump," she said.

After Clinton’s speech, some of the protesters took the stage and asked for unionization of the Republican candidate’s hotel.

"Mr. Trump said, 'Make America great,'" said Maria Jaramillo, a housekeeper who had worked at the hotel. "The Trump workers say, 'Start it here!'"

In response, Eric Trump, an executive vice president at the Trump organization and the presidential candidate's son, said that their employees are happy with their jobs and “have categorically rejected unionization,” despite pressure by the union.

Clinton and Trump have been the frontrunners of the race for presidential nomination in their respective parties. They have long been battling each other in head-to-head polls.

A recent poll by NBC/WSJ found that Clinton beats Trump, 49 percent to 39 percent, head-to-head.

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