A sizable portion of Fortune 500 chief executives said they favor Hillary Clinton for president, according to a new survey Fortune magazine conducted via email.

Just 42 percent said they're into presumptive Republican nominee Donald Trump. (Fortune only asked about the two front-runners. Sen. Bernie Sanders (I-Vt.), who is still in the race, was not an option.)

The poll isn't definitive. Just 71 CEOs responded and 16 of those declined to answer the presidential question. But 58 percent of respondents supported Clinton, providing yet more evidence that the business community, which traditionally goes for Republicans, is failing to line up behind Trump.

In 2012, CEOs overwhelmingly threw their support behind Mitt Romney's bid for the top job.

So far the 200 highest-paid CEOs have not given any money to Trump, according to data published last week in The New York Times.

Star Max/IPx Businessman struggles to earn business support.

Trump is ostensibly a "business candidate." He touts his expertise in deal-making and "leadership" -- as showcased on his reality TV show -- as qualifications to be president. Yet his positions on trade, immigration and the economy are turning off the business community, wrote Alan Murray, Fortune's editor-in-chief. Trump's comments on these issues show a "lack of understanding of the basics of government," Murray writes.

Trump has no political experience, traditionally a requirement for the nation's top job. And the biggest GOP donors haven't been rallying to give him much cash.

While a majority of CEOs may be willing to vote for Clinton, so far they haven't been that interested in giving her money. She's received just $56,000 in donations from the top 200 CEOs so far this year, according to the Times data.

To be sure, the nation's chief executives aren't the most political of animals, often shying away from publicly siding with one candidate over another. And given how controversial Trump is, many may be reluctant to go public with their support.

And things could change quickly now that the reality TV star has locked in the GOP nomination. On Tuesday, Politico reported that billionaire casino magnate Sheldon Adelson is working to set up a super PAC supporting Trump.

Editor's note: Donald Trump regularly incites political violence and is a serial liar, rampant xenophobe, racist, misogynist and birther who has repeatedly pledged to ban all Muslims -- 1.6 billion members of an entire religion -- from entering the U.S.