How will Obama handle child migrants?
© Greg Nash

Sen. John CornynJohn CornynHouse easily passes prison reform bill backed by Trump Senate panel clears bill to bolster probes of foreign investment deals McConnell tells senators he might scrap August recess MORE (R-Texas) called on Department of Homeland Security Secretary Jeh Johnson to outline the administration's plan to handle a huge influx of children migrating across the U.S.-Mexico border.

“What we need is a comprehensive look at what are the incentives that would convince parents to send their unaccompanied children on this horrific journey,” Cornyn said on Tuesday. “We need to know that the president’s plan is to deal with this.”

Cornyn’s comments came as senators announced a nearly $2 billion deal to address the issue after the administration said 47,000 children have been caught crossing the border since October of 2013.

Cornyn said the massive increase of unaccompanied children is a result of President Obama’s decision to defer deportation of undocumented immigrants who came to the country as children, a group commonly referred to as “Dreamers.”

Sen. John McCainJohn Sidney McCainOvernight Defense: Pompeo lays out new Iran terms | Pentagon hints at more aggressive posture against Iran | House, Senate move on defense bill Senate GOP urges Trump administration to work closely with Congress on NAFTA Sarah Sanders: ‘Democrats are losing their war against women in the Trump administration’ MORE (R-Ariz.) joined Cornyn, saying it is an issue that “deserves the attention of all of us.”

“There has to be some kind of organized effort that is bringing them here,” McCain said. “The average 5-or-6-year-old doesn’t just randomly decide to leave home one day.”

Johnson is scheduled to testify before the Senate Judiciary Committee on Wednesday and Cornyn is expected to grill him on this matter.

“The administration needs to deal with this crisis, particularly this humanitarian crisis,” Cornyn said. “Border agencies have been completely overwhelmed. ... This is a huge mess.”

The Texas Republican said this is what happens when the president "goes it alone" on immigration reform. The Senate has passed a bipartisan immigration reform bill but the House has failed to act.

Cornyn urged Obama to not apply the deferred action program to children currently arriving at the border, and provide resources to border states to address the problem.

"President Obama essentially created this problem and now he has the opportunity to work with us to fix it," Cornyn said.