Speaker Nancy Pelosi has scheduled a vote this week on a deal forged with Rep. John Katko (R-N.Y.) establishing a 10-member commission with subpoena power to investigate the Capitol insurrection. Yet House and Senate GOP leaders havent signed on. The House is also proceeding with a $2 billion security supplemental bill with uncertain prospects in the Senate.

Pelosis deal on the commission accommodates long-running Republican demands for equal representation on the commission, with each party selecting half the members. But after former President Donald Trumps repeated attacks on the election as well as an ongoing effort among a small contingent of Republicans to gloss over the death and destruction in the Capitol, the commission has become a sensitive issue in the GOP.

Senate Minority Leader Mitch McConnell declined to address the topic when asked on Monday and was noncommittal at a leadership meeting on the topic, instead soliciting input from his lieutenants, according to a source familiar.

House Minority Leader Kevin McCarthy has also declined to endorse the deal between Pelosi and Katko, a moderate Republican. The House is set to vote Wednesday on the commission, but as of now most House Republicans could vote against it, according to a House GOP source

Sen. Roy Blunt (R-Mo.), the top Republican on the Senate Rules Committee and the No. 4 GOP leader, said that he believes a commission could get in the way of Congresss ongoing inquiry into why the police response was inadequate during the riot. Blunt believes the structure of the U.S. Capitol Police hindered an effective response and that Congress needs to change its governance.

The commission will slow us down from some of the things we need to do with the Capitol Police and police board, Blunt said. Ill look at what they do but Im no fan of the commission, which on this topic I think will slow down getting to the decisions that we all know we need to make.

Democrats see things differently, particularly after Pelosi made significant concessions toward the GOP on the structure of the panel. Though Senate Majority Leader Chuck Schumer hasnt yet laid out a plan for consideration in the Senate, Democrats broadly support the bill. Still, they are aware the proposal will need at least 10 Republican supporters and are watching the vote total in the House this week.

Certainly if theres a 9/11 commission there needs to be a commission on the attempted overthrow of our government, said Sen. Debbie Stabenow (D-Mich.), a member of Democratic leadership.

Republicans are all over the map when it comes to the commission. Sen. Josh Hawley (R-Mo.), who led the GOPs challenge to the 2020 election in the Senate, said hed like to see any commission look into the killing of a Capitol Police officer in April and rioting on federal properties in 2020, a reference to other unrelated protests. Sen. John Cornyn (R-Texas) said there shouldnt be any artificial constraint to what the commission should look at. And Sen. Ron Johnson (R-Wis.) said hes not real nuts that congressional leadership would be selecting the commissioners.

Thats not a uniform view, however. Senate Minority Whip John Thune (R-S.D.) said most Republicans were going to hang back until the House passes it and that at some point the Senate will OK a commission principally focused on what happened here on Jan. 6.

Its entirely appropriate to understand why Jan. 6 happened, who was part of that and what lessons we can learn so something of this nature can be avoided in the future, said Sen. Mitt Romney (R-Utah).

Republican senators that could have the power to slow down or demand changes said they may take their cues from whether McCarthy ends up embracing the deal. As of Monday, House Minority Whip Steve Scalise (R-La.) was not whipping for or against the bill.

If the House Republican leadership and the House Democrat leadership can come together in a bipartisan way then Id look very seriously at what they wanted to propose, said Sen. Mike Crapo (R-Idaho). If youre going to get into this, the way to get bipartisan agreement is to look at the broad scope of issues.

The path forward for the Houses security supplemental is also unclear. Alabama Sen. Richard Shelby, the top Republican on the Senate Appropriations Committee, said that it needs to be looked at more closely and warned against a rush to judgment.