The release of two pages of President Trump's 2005 tax return this week has drawn attention to what's known as the alternative minimum tax.

Trump reported $153 million in income that year, and paid a tax rate of around 25 percent. But if it weren't for the alternative minimum tax, he would have paid closer to 4 percent in taxes. NPR's Marilyn Geewax (@geewaxnpr) explains what the alternative minimum tax is with Here & Now's Robin Young.