A federal judge on Tuesday largely blocked the Trump administration from implementing the latest version of the president’s controversial travel ban, setting up yet another legal showdown on the extent of the executive branch’s powers when it comes to setting immigration policy.

The decision from Judge Derrick K. Watson in Hawaii is sure to be appealed, but for now, it means that the administration cannot restrict the entry of travelers from six of the eight countries that officials said were either unable or unwilling to provide information the U.S. wanted to vet their citizens.

The latest ban was set to fully go into effect in the early morning hours of October 18, barring various types of travelers from Syria, Libya, Iran, Yemen, Chad, Somalia, North Korea and Venezuela. Watson’s order stops it, at least temporarily, with respect to all the countries except North Korea and Venezuela.

Trump had been blocked by courts from imposing his last two versions of the travel ban, but the ultimate question of whether he ever had the authority to do so remains somewhat murky.