Presumptive GOP presidential nominee Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE is optimistic about his chances of winning a general election match-up versus Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death 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 Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death 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.