President Joe Biden said it is a “real possibility” that Senate Democrats could seek to revise the chamber’s filibuster rules to overcome a Republican blockade on raising the debt ceiling.

The president made his comments late Tuesday night amid a partisan standoff in Congress over raising the government’s debt ceiling, which threatens the federal government’s credit rating and the global economy. When asked about Democrats utilizing the “nuclear option” to prevent Republicans from filibustering to raise the debt limit, Biden said, “Oh, I think that’s a real possibility.”