The US Supreme Court has said it will consider a challenge to one of President Barack Obama's key immigration reform plans.
The plan would lift the threat of deportation from five million migrants living illegally in the US.
A coalition of 26 mostly conservative states, led by Texas, has been successful in lower court challenges.
A decision from the highest US court is expected in the early summer, just as the US election gets into full swing.
"We are confident that the policies will be upheld as lawful," said White House spokeswoman Brandi Hoffine.
President Obama announced the plan, known as Deferred Action for Parents of Americans and Lawful Permanent Residents (DAPA), in November 2014.
