WASHINGTON (AP) — With a showdown vote looming, Senate Republicans are misrepresenting the timeline of a proposed independent commission to investigate the Jan. 6 U.S. Capitol insurrection.

The House easily approved the bill last week with 35 Republicans signing on. But the measure faces an uncertain fate in the evenly divided Senate. Senate Republican leader Mitch McConnell is opposed and former President Donald Trump is demanding the effort be quashed.

On Sunday, Sen. Susan Collins, R-Maine, suggested that a roadblock to gaining GOP support is the commission's timing, echoing concerns from R...