Environment and Public Works Chairman Barbara Boxer (D-Calif.) on Monday urged Republicans to drop a planned boycott of this week’s markup of her ambitious climate change legislation, warning that the panel’s consideration of the bill will move forward with or without GOP participation.

Ranking member James Inhofe (R-Okla.) asked that GOP Senators protest the markup, which is expected to last at least through this week. Inhofe is demanding that the Congressional Budget Office review and the Environmental Protection Agency provide a full analysis of the legislation.

In a statement released by her office Monday, Boxer criticized the GOP’s move. “The Committee Republicans should rethink their approach. As long as they refuse to come to work, they are not participating in one of the most important issues facing our generation,— Boxer said, warning that “if they do not, we will move forward in accordance with the rules of the Senate and of this Committee.—

Although Boxer can begin the markup with a simple majority of EPW members, it is unclear whether she could actually hold votes on amendments or report out the bill, since committee rules appear to require at least two members of the minority be present for a quorum, a GOP aide said.