The chairman of the House Judiciary Committee is demanding to know how federal officials will prevent fraud under President Obama's new deportation policy.

Under the directive, the Department of Homeland Security will stop deporting young illegal immigrants who were brought to the United States as children, provided they meet certain criteria. An estimated 800,000 immigrants won't be deported under the policy. 

Judiciary Chairman Rep. Lamar Smith (R-Texas.) sent a letter Tuesday to John Morton, the director of United States Immigration and Customs Enforcement, ripping the policy as an "amnesty plan" that will "encourage massive amounts of fraud."

"It is your duty as Director of ICE to make every possible effort to ensure fraud is not perpetuated within the immigration system," Smith wrote. "The administration's policy is an incentive for any illegal immigrant to perpetuate fraud in our immigration system simply in hopes of receiving administrative amnesty

Smith asked Morton to respond to a series of questions about the policy, including, "Have many individuals been granted deferred action pursuant to this policy thus far?" and "Are aliens who become fugitives after being ordered removed eligible for deferred action under the policy?"

Another House Republican, Rep. Lou BarlettaLouis (Lou) James BarlettaTrump endorses Arkansas governor's reelection bid ahead of primary Trump's infrastructure plan hits a dead end Trump congratulates 'special guy' Barletta on win in Pennsylvania MORE (R-Pa.), on Monday called for the House Homeland Security and Judiciary Committee to investigate the directive. He also introduced two bills on Friday related to the new immigration policy. One, H.R. 6070, calls for a study to analyze how the new policy will affect national security and the American workforce. The other, H.R. 6069, is meant to protect DHS staff from punishment if they refuse to follow the new directive.

Under Obama's new policy, young immigrants won't be deported and can receive work visas provided they arrived in the United States before they were 16, lived in the country for five consecutive years, are currently in school, graduated from high school, earned a GED, or served in the armed forces. They must also currently be 30 years or younger and not have been convicted of a felony or serious legal misdemeanor.

— This story was updated at 2:16 p.m. 

Read Smith's letter below:

Dream Act Letter Ice