A new poll conducted completely after Donald Trump's third campaign shakeup shows him losing to rival Hillary Clinton by double digits, with an overwhelming majority of voters calling on the Republican presidential candidate to release his tax returns.

Quinnipiac's new national poll shows Clinton ahead of Trump, 51 to 41, an eight-point jump since June.

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When third party candidates are included in the poll, 10 percent of likely voters back Libertarian candidate Gary Johnson, according to the Quinnipiac poll, while Green Party candidate Jill Stein has the support of 4 percent of voters. In that matchup, 34 percent of independents supported Trump, 33 percent for Clinton and 19 percent for Johnson, with 9 percent for Stein.

Johnson is hoping to become the first third-party candidate since Ross Perot in 1992 to qualify for the presidential debates. In order to join Clinton and Trump on stage this fall, Johnson will need to average 15% in five national polls chosen by the Commission on Presidential Debates.

Furthermore, 74 percent of all voters tell Quinnipiac that Trump should release his tax returns publicly, including 62 percent of Republicans. A breakdown of the candidates' supporters from Politico below:

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