Here’s what they’ll do in the coming days, per a senior Senate aide:

Establish a litmus test for Republicans who care about the integrity of the Russia investigation: to appoint a special prosecutor.

Call for Attorney General Jeff Sessions to recuse himself from deciding Comey’s replacement, given the new FBI director will be overseeing the investigation into whether the Trump campaign colluded with Russia during the election.

Extract a full explanation from Rod Rosenstein about his role in Trump’s firing of Comey. The deputy attorney general will brief senators this week and they’ll have a chance to grill him.

Urge Republicans to support Democrats’ calls for Comey to testify before a congressional committee.