Republicans believe they're above the law, & for many, it's true, e.g.:
"Conservative activist Leonard Leo said on Thurs that he will not comply with a subpoena from the SJC, which is investigating undisclosed travel & gifts to SCJs Clarence Thomas & Samuel Alito.
The Dems would have to hold a full Senate vote to enforce the subpoena & are unlikely to be successful. Durbin said he sent the subpoena bc Leo has refused to cooperate with the CMTE’s inquiry."