Presumptive GOP presidential nominee Donald TrumpDonald John TrumpTrump nominates Jeffrey Rosen to replace Rosenstein at DOJ McCabe says ‘it’s possible’ Trump is a Russian asset McCabe: Trump ‘undermining the role of law enforcement’ MORE is optimistic about his chances of winning a general election match-up versus Hillary ClintonHillary Diane Rodham ClintonSanders campaign reports raising M in less than a day The Memo: Bernie Sanders’s WH launch sharpens ‘socialist’ question Roger Stone invokes gag order in new fundraiser MORE because she hasn’t been vetted before, spokeswoman Katrina Pierson said Wednesday.

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“Oh, absolutely,” Pierson said in response to a question about Trump’s enthusiasm for facing Clinton in November. “Mainly because Hillary Clinton has never been truly vetted before. Particularly by the media,” she said to MSNBC’s Tamron Hall.

“How many times has Hillary Clinton been asked about the specific role in Benghazi outside of the testimony?” Pierson asked.

Pierson said younger voters need to be informed about Clinton's past.

“There’s an entire generation of voters out there that know nothing about Hillary Clinton other than what they have heard in the last two to three years,” she said.

A day earlier, Trump became the presumptive nominee after a resounding win in the Indiana primary. Trump's closest rival, Ted CruzRafael (Ted) Edward CruzO'Rourke mulling another Senate run as well as presidential bid Texas senator introduces bill to produce coin honoring Bushes Trump working on labels for 2020 Dems: report MORE, suspended his campaign Tuesday evening shortly after the results were announced.

Trump's remaining challenger, John Kasich, will drop out of the race on Wednesday, according to multiple reports.