Presumptive GOP presidential nominee Donald TrumpDonald John TrumpDem senator says Zelensky was 'feeling the pressure' to probe Bidens 2020 Dems slam Trump decision on West Bank settlements Trump calls latest impeachment hearings 'a great day for Republicans' MORE is optimistic about his chances of winning a general election match-up versus Hillary ClintonHillary Diane Rodham ClintonDemocrats ask judge for quick ruling on McGahn subpoena Hillary Clinton: 'Every day Stephen Miller remains in the White House is an emergency' The Memo: Centrists change tone of Democratic race 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 CruzLawmakers spar over surveillance flight treaty with Russia Senators voice support for Iran protesters but stop short of taking action Prisons chief: FBI investigating whether 'criminal enterprise' played role in Epstein 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.