According to a senior-level campaign source, Republican presidential nominee Donald Trump is set to propose excluding child care expenses from taxation in a major economic speech today.

Today Trump is expected to propose ending the estate tax, also known as the “death tax,” and also reducing taxes across the board. Trump has called this proposal the biggest tax reform America has had since Ronald Reagan’s tenure.

During the speech Trump will also continue his focus on trade agreements such as NAFTA, as well as reducing regulations, focusing on domestic energy sources and reducing business income taxes to 15 percent.

The speech is set for 11:30 a.m. in Detroit, and Trump is expected to be joined by some members of his newly established economic advisory panel.

Last September Trump first revealed his economic ideas and tax plan during a news conference at Trump Tower. The campaign source told ABC News that today’s speech in Detroit will “expand on the plan last fall, delivering a more detailed economic proposal.”