Former presidential candidate Carly Fiorina warned Republican voters against labeling supporters of Donald Trump as racist or xenophobic. She argued Monday that it's a "mistake" to do this and paint his voters with "a broad brush."

Fiorina, who recently endorsed Sen. Ted Cruz, said that while it's easy to lump them together under certain terms and label them, its "always a mistake" to do so. The former Hewlett-Packard CEO made the remarks to students at an event hosted by the Georgetown Institute of Politics and Public Service.

"It is really easy to paint all of Trump's supporters with a big, wide brush. Just like it's really easy to paint other groups with a big, wide brush, and it's always a mistake," Fiorina said. "I know some Trump voters, and they're not xenophobic, and they're not racists, and they're not backwoods. Now I happen to profoundly disagree with them."

"Ultimately, this nation is going to happen to be unified around the things that we all agree upon. It's actually why I ran for president, because what we all agree on is that the system isn't working," Fiorina continued. "In a way, I think there are a lot of Bernie Sanders voters who are voting because they are so angry at the system. I think one of the reasons there is a lack of enthusiasm is because a lot of voters understand she [Hillary Clinton] is the system."

"Rather than paint someone's supporters with a broad brush, what I will continue to do is challenge the candidate, whether that's Hillary Clinton or Donald Trump on who they are," Fiorina added.

After endorsing Cruz last week, Fiorina has been out on the campaign trail for the Texas senator and pointed to his ability to beat Trump as the reason for her endorsement. Fiorina also pushed back on the idea that only Trump can win the GOP nomination outright, telling moderator Mo Elleithee that it can be done if Sen. Marco Rubio and Ohio Gov. John Kasich both get out of the race — which she urged them both to do.

"It will depend on Rubio and Kasich exiting the race. I hope they do. I hope they're statesmanlike and understand and exit the race," Fiorina said. "But yes — if we have four people in this race all the way to the convention, then your statement is correct. If it comes down to a two-man race, then absolutely Ted Cruz can get the delegates."