Plus, as the new letter makes clear, even with a rules change, President Obama could easily veto the Senate’s Iran bill, making the whole effort largely a symbolic one.

“We are under no illusion that the elimination of the Senate filibuster for some votes will guarantee the passage of legislation much less its enactment into law,” they wrote on Thursday. “However, a move by the Senate to a majority vote that can approve some legislation would make it much easier for Congress to advance meaningful solutions to challenges our country faces.”

In addition to Smith — who is the leader of the House Science Committee — the new letter is signed by prominent lawmakers including Judiciary Chairman Bob Goodlatte (R-Va.), Rules Chairman Pete Sessions (R-Texas) and Homeland Security Committee head Michael McCaul (R-Texas).

Despite the show of support, the letter comes amid the last gasp for Congress’s review of the Iran deal.