Donald Trump's latest policy proposal, a program to pay for childcare expenses through tax deductions, applies equally to same-sex couples raising children.

The Trump campaign's early outreach to reporters – including a Monday night outline of his Tuesday speech on the subject and a Tuesday morning conference call with reporters – made no mention of the subject.

Neither does an op-ed by his daughter Ivanka that ran Tuesday evening on the website of The Wall Street Journal.

And Trump himself skipped over it during a 20-minute speech introducing the proposal Tuesday night in a suburb of Philadelphia.

But a policy paper distributed two hours before the speech at a suburban Philadelphia community center includes a line acknowledging that gay and lesbian couples would be eligible for the same tax benefits as heterosexuals.

Donald Trump, the Republican nominee for president, unveiled a far-reaching childcare tax credit proposal on Tuesday with a wrinkle – equal treatment of same-sex parents – that could sideline his policy with evangelical conservatives

Ivanka Trump, the GOP nominee's 34-year-old daughter, introduced Trump Tuesday night and had a significant hand in drafting his new childcare tax-credit proposal

'Will same-sex couples receive the benefits?' one item in an official campaign Q&A reads.

'The benefits would be available in the same way that the IRS currently recognizes same-sex couples: if the marriage is recognized under state law, then it is recognized under federal law,' the answer reads.

A landmark Supreme Court decision in 2015 effective legalized the institution of gay marriage in all 50 states, forcing state and local officials to issue marriage licenses to couples without discriminating on the basis of sexual orientation.

Ivanka Trump's op-ed boasted that '[m]y father is prepared to chart a new course that promotes strong families and celebrates their individual needs.'

Conservative evangelical groups were expected to hail Trump's proposal, which also treats elder-care expenses as deductible, as a plan to support cash-strapped parents trying to raise sons and daughters in two-earner households.

Trump has to thread a needle, appealing to his white, middle-class and largely Christian base while not violating his beliefs or making evangelicals turn against him

There are just 56 days left until the presidential election, a time-crunch that will force Trump and Hillary Clinton to provide great detail in their loosely defined policy positions

But representatives from two such organizations, who requested anonymity in advance of official statements their leadership might make, said they were nervous about the policy's implications.

'It may be something other than what we first thought it was,' one told DailyMail.com.

'Trump talks about a Trojan horse with runaway immigration?' another pondered. 'This could be the same kind of thing with government policy that should be helping parents raise healthy, well-adjusted children.'

Two leaders of prominent Christian conservative groups declined to comment on the record.

Visible faith leaders in the Bible Belt may find it difficult to embrace Trump's proposal since it includes an acknowledgement that federal tax policy should treat same-sex couples the same as those in traditional marriages.

But with Trump as the GOP's standard-bearer, they also may find themselves uneasy about opposing him openly.

A Trump spokesperson did not respond to a request for comment.

Trump himself spoke Tuesday afternoon in Iowa, where more than half of registered Republican voters identify themselves as evangelical Christians, and made no mention of including gay couples in his plan.

He has been standoffish on the campaign stump about his views on gay marriage, sometimes parrying press-conference questions with an assertion that his beliefs are well-known.

The Republican nominee is expected to unveil his proposal Tuesday evening after an introduction from his daughter Ivanka, who has said she had a significant hand in drafting it.