They don't want to be on the record as voting to support the war. So they avoid the vote taking altogether.

@georgetakei This is relatively dishonest framing of what happened here. "Pro forma" sessions are something generally agreed as including no business, and passing no votes. Generally they, by unanimous consent of the almost nobody showing up agree to recess.

Our party trying to pass a resolution by unanimous consent was abnormal. Everything about the Trump administration is also abnormal and bad, but ending a pro forma session without making any decisions was quite normal!

@georgetakei Generally having taken a course on Constitutional Law is an absolute curse during the time of Trump, but for anyone who comes across my comment, this is a good explainer of what a pro forma session is, and why it would not have any votes to stop Trump, even if a Democrat was running it: https://legalclarity.org/what-is-a-pro-forma-session-and-how-does-it-work/
What Happens in a Pro Forma Session of Congress?

Pro forma sessions let Congress stay technically โ€œin sessionโ€ without doing real work โ€” and that distinction matters more than you might think for appointments and vetoes.

LegalClarity