Democrats in Congress have long argued that the ongoing intelligence committee investigations into Russia’s interference in the presidential election and the Trump campaign’s ties to the Kremlin are unlikely to get to the bottom of the issue. Now a group of “Never Trump” Republicans are planning to pressure GOP leaders to establish a bipartisan select committee to take over the inquiries and settle the matter once and for all.

Stand Up Republic, a nonprofit organization led by former independent presidential candidate Evan McMullin and his running mate, Mindy Finn, is launching a public campaign aimed at building support among Republicans for consolidating the various congressional Russia-related investigations into one empowered and fully funded select committee. The organization’s ad, which goes live Tuesday with a six-figure television ad buy, makes the case that the Russia issue is too important not to investigate fully.

“Trump’s Russia crisis. Secret contacts. Conflicting stories. Mounting signs of hidden ties and shady deals. Fear our president is compromised,” says the narrator. “The values of liberty, justice and honor shaped America. Generations fought for freedom, and presidents of both parties stood against foreign tyrants like Vladimir Putin. Why won’t Donald Trump? Tell Congress to name a bipartisan select committee to get the truth?”