Secretary of State Rex Tillerson warned lawmakers on Wednesday not to pass sanctions legislation that could preclude “constructive dialogue” with Russia.

Senate lawmakers agreed to a package of sanctions punishing Russia for interfering with the 2016 presidential election, destabilizing Ukraine, and supporting Syrian President Bashar Assad in an ongoing civil war. That legislation is expected to pass as part of a suite of sanctions targeting Iran, which is Russia’s partner in Syria. Tillerson didn’t make his opposition explicit, but he offered a cautionary “point of view” about the bill.