Presumptive GOP presidential nominee Donald TrumpDonald John TrumpWSJ: Trump ignored advice to confront Putin over indictments Trump hotel charging Sean Spicer ,000 as book party venue Bernie Sanders: Trump 'so tough' on child separations but not on Putin MORE is optimistic about his chances of winning a general election match-up versus Hillary ClintonHillary Diane Rodham ClintonBernie Sanders: Trump 'so tough' on child separations but not on Putin Anti-Trump protests outside White House continue into fifth night Opera singers perform outside White House during fourth day of protests MORE because she hasn’t been vetted before, spokeswoman Katrina Pierson said Wednesday.

ADVERTISEMENT
“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 CruzWashington needs to end hidden inflation tax on our capital gains GOP tax writer introduces bill to reduce capital gains taxes Senators push to clear backlog in testing rape kits 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.