A bill to create a commission that would examine the Jan. 6 riots at the Capitol is on the verge of failing a key Senate vote as Republican lawmakers become increasingly concerned Democrats will politically weaponize it against their party ahead of the 2022 midterm elections.

Only three Senate Republicans so far have pledged to advance a House-passed bill to create the commission. At the same time, several other Republicans say they are undecided but eyeing key changes that could help win their support.