Sen. Susan Collins (R-Maine) on Sunday expressed optimism that Senate Democrats and Republicans could reach agreement on establishing a Jan. 6 commission so long as the House-passed bill undergoes several changes. Collins told ABC’s “This Week” that she “strongly” backs the establishment of an independent commission to probe the events around the Jan. 6 Capitol breach, but her support is conditional on bipartisan staffing and a report issued no later than by the end of this year. The House approved a bill last week that would establish the Jan. 6 commission, which would be modeled on the commission that probed the 9/11 terror attacks. The investigative body would feature 10 members—five appointed by Republicans and five by Democrats—but Collins also wants commission staff to be appointed in a bipartisan fashion. “I think that both sides should either jointly appoint the staff or there should be equal numbers of staff appointed …