Presumptive GOP presidential nominee Donald TrumpDonald John TrumpSunday shows preview: Trump sells U.N. reorganizing and Kavanaugh allegations dominate Ex-Trump staffer out at CNN amid “false and defamatory accusations” Democrats opposed to Pelosi lack challenger to topple her MORE is optimistic about his chances of winning a general election match-up versus Hillary ClintonHillary Diane Rodham ClintonPompeo: 'We've not been successful' in changing US-Russia relations Michael Moore ties Obama to Trump's win in Michigan in 2016 The Memo: Could Kavanaugh furor spark another ‘year of the woman’? 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 CruzViral video shows O’Rourke air-drumming to the Who’s ‘Baba O’Riley’ after Cruz debate Five takeaways from Cruz, O'Rourke's fiery first debate NY Times, McCabe give Trump perfect cover to fire Rosenstein, Sessions 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.