President Trump’s nominee to be ambassador to South Korea isn’t sure when in the process of North Korea negotiations the U.S. should ease economic pressure on the regime.

“I think that’s part of the negotiations, and that’s certainly part of the deliberations that will happen back here in Washington and in Seoul with South Korea,” retired Adm. Harry Harris, who led the U.S. military in the Pacific region before being tapped for a diplomatic post, told the Senate Foreign Relations Committee on Thursday.