Libertarian presidential nominee Gary JohnsonGary Earl JohnsonPotential GOP primary challenger: Trump's 'contempt for the American people' behind possible bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration Former Mass. governor takes step toward Trump primary challenge MORE is calling Donald TrumpDonald John TrumpJustice Department preparing for Mueller report as soon as next week: reports Smollett lawyers declare 'Empire' star innocent Pelosi asks members to support resolution against emergency declaration MORE's comments about a U.S. district judge and undocumented immigrants racist. 

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"When it comes to Mexican immigrants — and that he would call immigrants from Mexico murderers and rapists — look, that's just not true," Johnson said on CNN's "State of the Union" Sunday. 

"The stuff he is saying is just incendiary," said the former New Mexico governor. 

"Incendiary, but you think he himself is racist?" asked host Brianna Keilar. 

"Based on his statements, clearly," Johnson said. 

"If his statements are being made, is that not reflective of — if you look at the definition of racism — calling a U.S.-born Hispanic Mexican and his inability to judge others, I think I'm now semi-quoting [Speaker] Paul RyanPaul Davis RyanThe Hill's 12:30 Report: Sanders set to shake up 2020 race McCabe: No one in 'Gang of Eight' objected to FBI probe into Trump Unscripted Trump keeps audience guessing in Rose Garden MORE [R-Wis.] here." 

Johnson was referring to Trump's attacks on U.S. District Judge Gonzalo Curiel. Trump, the presumptive GOP presidential nominee, said Curiel's Mexican heritage prevented him from presiding fairly over lawsuits involving Trump University.