Many states, not just blue ones, refused to supply the personal information demanded by the republicans on Pence's commission.It fell apart because it was needing to be run by STATES (who are who conduct elections), and many states (primarily blue) refused to cooperate. Trump should have known they wouldn't cooperate, because their power depends on these illegal votes.
On June 28, 2017, Kobach, in conjunction with the Department of Justice, asked every state for personal voter information. The request was met with significant bipartisan backlash; 44 states and the District of Columbia declined to supply some or all of the information, citing privacy concerns or state laws
Presidential Advisory Commission on Election Integrity - Wikipedia