Sen. Bernie Sanders of Vermont wants U.S. troops home from Iraq. But in a clear jab at President Donald Trump’s foreign policy approach, he said he wouldn’t do it with a tweet.

Sanders’ appearance at a press conference Thursday to push legislation blocking war with Iran is the latest indicator that the impeachment trial isn’t the only thing that can lure Democratic presidential hopefuls off the campaign trail and back to the Senate.

Senators seeking the Democratic presidential nomination were also back on Capitol Hill for Wednesday afternoon’s classified briefing on Trump’s order for the targeted killing last week of Iranian Gen. Qassem Soleimani in Iraq.

Sens. Michael Bennet of Colorado, Cory Booker of New Jersey, Amy Klobuchar of Minnesota and Elizabeth Warren of Massachusetts came back to D.C. for the all-senators briefing that seemed to yield more questions than answers for many lawmakers.

On Thursday, Sanders, who also attended the Wednesday briefing, headlined the unveiling of legislation with California Rep. Ro Khanna and other Democrats that would bar funding for military action against Iran except in cases of self-defense of American interests or in compliance with the restrictions of the War Powers Resolution.