Republicans are increasingly worried that Donald Trump’s candidacy will hurt the party’s quest to maintain the Senate majority in 2016. The real estate mogul’s controversial comments on immigration could cause a trickle-down effect and haunt Republican Senate candidates, party strategists say.

“I think it’s pretty clear that some of [Trump’s] more dramatic proposals on immigration will certainly affect races like the Nevada senate race in particular,” said one Nevada GOP strategist.

The debate over Trump’s immigration stance “will, by its very nature spill down to races,” the strategist said.

“In a state like Nevada, the Hispanic element is absolutely essential.”