President Donald Trump faces a fight within his own party over whether he should immediately end deportation relief for undocumented immigrants brought to the U.S. as children, a central part of his campaign pledge to take a harder line on illegal immigration.

Trump began issuing a set of executive actions related to immigration Wednesday, but it is not clear his early steps will affect deportation protections for about 750,000 young immigrants granted under a 2012 executive order by former President Barack Obama.

John Cornyn of Texas, the No. 2 Senate Republican leader, said this week that a bipartisan proposal allowing a three-year extension of the protections doesn't go far enough. He said he favors a permanent resolution as part of a broader effort to bolster the U.S.-Mexico border.