Four more rank-and-file Democrats called for opening an impeachment inquiry against President Donald Trump on Sunday, inching lawmakers closer to a significant symbolic milestone: a majority of all House Democrats.

Though the steadily climbing total may not move Speaker Nancy Pelosi off of her resistance to opening a formal impeachment inquiry, Sunday’s burst of support suggests momentum behind the effort is growing and accelerating. More than a dozen Democrats — including Rep. Katherine Clark (D-Mass.), a member of Pelosi’s leadership team — have newly signaled their support since former special counsel Robert Mueller testified to Congress on Wednesday.

The four who issued their support on Sunday, all from Washington state, bring the total number of House Democrats who have publicly said they’d vote for an impeachment inquiry to 107 — 11 shy of a majority of the Democratic Caucus — with backers of an inquiry promising there are more waiting in the wings.