Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE's presidential campaign launched a new website encouraging Republicans who are not supporting Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE to take a pledge vowing not to vote for the presumptive GOP nominee.

The website, republicansagainsttrump.org, was launched on June 2, according to Politico, but the campaign started buying ads to promote the website after that. The website was registered on May 27.

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The site urges people to take a pledge to get a free Republicans Against Trump sticker.

"Donald Trump is not qualified to be president," the pledge says. "He does not represent my beliefs as a Republican and, more importantly, my values as an American. He does not speak for me and I will not vote for him."

The bottom of the website says: "Paid for by Hillary for America."

Clinton's campaign on Tuesday also began fundraising off the candidate clinching the Democratic presidential nomination and becoming the first woman to be the nominee of a major political party in the U.S.

Clinton will now pivot to the general election. She plans to begin campaigning in critical battleground states as her focus shifts to a match-up against Trump. She will make campaign stops next week in Ohio and Pennsylvania.