Senate Republicans are shrugging off President Donald Trump’s demands to fire the chamber’s parliamentarian, a nonpartisan official refereeing which provisions of the GOP’s $70 billion immigration enforcement bill violate Senate rules.

Trump made his latest case against Senate Parliamentarian Elizabeth MacDonough, accusing her of a liberal bias on Wednesday. The criticism comes as MacDonough has determined that security funding for the White House complex, including the under-construction ballroom, failed to comply with reconciliation rules and would not be able to skirt a filibuster with the rest of the measure.