Maine Senator Susan Collins was a supporter of the bill to create a commission that would investigate the breach of the U.S. Capitol in January.

The final vote was 54-35, 6 votes short of passing. Collins voted for the bill, along with 5 other Senate Republicans.

Collins said the events of January 6th need to be investigated by a bipartisan commission, but the creation of that commission faced resistance from fellow Republicans.

Collins says the House bill was flawed though, and although members would be Democrats and Republicans, the commission’s staff would be appointed by Democrats. She proposed an amendment to make the staff makeup bipartisan as well.

“I authored a bipartisan amendment that would have helped ensure that the commission operated in a bipartisan and fair manner and that it completed its work in a timely manner.  It is unfortunate that we fell a few votes short of what was needed to begin debate on this vital legislation needed to help us better understand that terrible day,” Collins said in a statement released Friday.

Collins says she could easily have passed the amendment if not for the filibuster, which would need the support of at least 10 Republicans to be defeated.