Tonight, on All In: Donald Trump and the rump MAGA caucus make their pick. Tonight: Jamie Raskin on what a Jim Jordan speakership means for the country. Then, the explicit Democratic appeal for Republicans to join them. Plus, new reporting on nuclear secrets shared with customers at Donald Trump's resort. And why Republicans think they can run the Doctor. Oz playbook again in Pennsylvania.

Guests: Rep. Jamie Raskin, Brendan Buck, Luke Broadwater, Lisa Rubin, William Cohen