Donald Trump has “pretty much decided” how he would tackle immigration reform as president despite his recent ambiguity on the issue, former New York City Mayor Rudy Giuliani said Monday.

The Republican presidential nominee has vacillated on his immigration policy over the last two weeks, and refused to clearly say whether he still intends to deport all immigrants living in the U.S. illegally or give them some way to stay in the country. Trump plans to clarify his positions during a speech on Wednesday in Arizona.