Enthusiasm for impeaching top Biden officials has spread from the fringes of the House Republican conference to its mainstream — foreshadowing the intense pressure Kevin McCarthy will face from his colleagues if he's Speaker next year.

Why it matters: For the first year of President Biden's term, it was mostly the hard right of the GOP who entertained impeaching the president and his Cabinet secretaries. But those deliberations are now happening among a much larger group — even with virtually no precedent or legal justification.

Behind the scenes: The largest body of conservative House members — the Republican Study Committee, which represents more than 150 members — is laying the groundwork to push for the impeachment of Homeland Security Secretary Alejandro Mayorkas.