"The only thing that will stop him from attacking us, because nobody is safe, is his resignation.”

Donald Trump’s vengeful, condescending, and misogynist tweet attacking New York Democratic Sen. Kirsten Gillibrand on Tuesday morning has sparked a fast-moving firestorm against the White House.

And it appears to be one that the administration has no way of controlling.

After Gillibrand on Monday insisted Trump resign in light of the many accusations of sexual harassment and abuse made against him, he responded by denouncing her as a corrupt “flunky” who would “do anything” to amass power and money.

Gillibrand quickly fired back:

Trump’s ugly attack on a sitting female member of Congress sparked genuine outrage within the Democratic Party, where senior members this year have at times been reluctant to discuss trying to remove Trump from office.

Massachusetts Sen. Elizabeth Warren immediately condemned Trump for trying to “slut-shame” Gillibrand.

And hours later, Hawaii Sen. Mazie Hirono joined four of her Democratic colleagues — Gillibrand, Cory Booker of New Jersey, and Jeff Merkley and Ron Wyden of Oregon — in explicitly calling for Trump’s resignation.

“I said today that the only way to stop this president — who has a narcissistic need for attention, he’s a misogynist and admitted sexual predator and a liar — the only thing that will stop him from attacking us, because nobody is safe, is his resignation,” Hirono told NBC News.

Hirono’s statement came on the heels of a letter from the Democratic Women’s Working Group to the chairman and ranking member of the House Oversight Committee, demanding a Congressional investigation into the litany of allegations against Trump.

As of right now, the White House has no answer for this escalating story and no coherent strategy for how to stop it.

But five Democratic senators have a good suggestion.