Even though Trump campaigned on a promise to roll back Obama’s executive orders on immigration, the Republican has so far left intact an order safeguarding 750,000 people who were brought to the United States illegally as children, known as the “dreamers.”

The issue has become a flashpoint for White House advisers divided between a more moderate faction such as chief of staff Reince Priebus and immigration hardliners Stephen Miller and Steve Bannon, said a former congressional aide who has been involved with immigration issues in Washington.

Priebus has said publicly that Trump will work with Congress to get a “long-term solution” on the issue.

Meanwhile, Miller, said to have mastered the thinking of his former boss and anti-immigration advocate Jeff Sessions, Trump’s nominee for U.S. Attorney General, as well as Bannon, former head of right-wing Breitbart News, have pushed Trump to take a harder approach and rescind the protections.