Some of the 175 Republicans who voted against establishing an independent commission to investigate the Capitol riot supported a commission in January.

In the days after the Jan. 6 attack, 30 Republicans co-sponsored a commission bill introduced by Rep. Rodney Davis (R-Ill.). This week, even more Republicans endorsed the idea Davis was one of the 35 Republicans who broke with party leaders and voted in favor of a commission on Wednesday.

After all, it is common for Congress to establish an advisory commission in the wake of a disaster or to help with some complicated policy problem. Congress has established dozens and dozens of commissions in recent decades.

But 16 of the Republicans who co-sponsored the Davis bill in January voted against the newer bill to establish a commission , which was written by House Homeland Security Chair Bennie Thompson (D-Miss.) and the committees top Republican, Rep. John Katko (R-N.Y.).

One of them, Rep. Jim Banks (R-Ind.), had such a strong change of heart that he urged his colleagues to vote against the commission bill Wednesday during a Republican Study Committee meeting before the vote. Banks refused to speak to HuffPost about the commission.

The Davis bill from January envisioned a similar commission to the one in the Thompson-Katko bill, with five expert members appointed by each party, the same power to issue subpoenas, and a final report with recommendations for corrective measures. Both bills are modeled on the legislation that established the Sept. 11, 2001, terrorist attacks commission.