WASHINGTON, DC - JUNE 24: House Ways and Means Committee Chairman Kevin Brady (R-TX) introduces the House Republicans' tax reform proposal in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. Brady said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JUNE 24: House Ways and Means Committee Chairman Kevin Brady (R-TX) (R) introduces the House Republicans' tax reform proposal in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. Brady said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JUNE 24: Speaker of the House Paul Ryan (R-WI) (C) addresses a news conference to introduce the House Republicans' tax reform proposal in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. House Ways and Means Committee Chairman Kevin Brady (R-TX) said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JUNE 24: House Ways and Means Committee Chairman Kevin Brady (R-TX) (R), Speaker of the House Paul Ryan (R-WI) (L) and House Majority Whip Steve Scalise (R-LA) address a news conference to introduce the House Republicans' tax reform proposal with in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. Brady said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JUNE 24: Speaker of the House Paul Ryan (R-WI) speaks during news conference to introduce the House Republicans' tax reform proposal in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. House Ways and Means Committee Chairman Kevin Brady (R-TX) said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JUNE 24: House Ways and Means Committee Chairman Kevin Brady (R-TX) introduces the House Republicans' tax reform proposal in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. Brady said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JUNE 24: Speaker of the House Paul Ryan (R-WI) (C) joins fellow Republicans for a news conference to introduce their tax reform proposal in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. House Ways and Means Committee Chairman Kevin Brady (R-TX) said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JUNE 24: Speaker of the House Paul Ryan (R-WI) arrives for a news conference to introduce the House Republicans' tax reform proposal in the Rayburn Room at the U.S. Capitol June 24, 2016 in Washington, DC. Brady said that the GOP wants to 'bust up' the Internal Revenue Service, get rid of the estate tax and create a tax code so simple that Americans can file on a postcard-sized form. (Photo by Chip Somodevilla/Getty Images)