The horrible Kyl-Lieberman Amendment on Iran may be voted on in the Senate as soon as today. Its passage, particularly if it’s lopsided, would be a significant step toward war. Call your senator right now (Capitol switchboard: 202-224-3121) to tell them to oppose it.
I don’t have any hope this will fail, but it would be nice for it not to be a shut out. Call now.
AND: You should write them, too. Get their contact forms at senate.gov or via Just Foreign Policy. A useful guide on writing to congress is here, although of course there’s no time to send something by mail.