Republican presidential nominee Donald Trump is scheduled to speak this evening in Pennsylvania to announce more details about his child care proposal.

In a speech last month, Trump called for child care costs to be tax-deductible. His plan was immediately criticized as benefiting mostly wealthy families – but that criticism could shift depending on the specifics that come out tonight.

So far the broad outlines of a tax-deduction plan could be linked to state guidelines.

"You will reduce your taxable income by the average child care cost in your state and this will apply whether you are a stay-at-home parent or a working parent," said Elaine Maag, Senior Research Associate at the Urban Brookings Tax Policy Center.