Democrats have introduced a resolution to strip a pro-Trump Republican lawmaker of her committee assignments over her past posts on social media.
Marjorie Taylor Greene has embraced conspiracy theories, including that school shootings and 9/11 were staged.
The group of Democrats that filed the resolution called it a “line-in-the-sand moment for the Republican Party”.
The Georgia congresswoman last month introduced a measure attempting to impeach US President Joe Biden.
On Monday, Greene tweeted: “If Democrats remove me from my committees, I can assure them that the precedent they are setting will be used extensively against members on their side once we regain the majority after the 2022 elections.
“And we will regain the majority, make no mistakes about that.”
Elected to Congress in November, Greene was assigned to the Education and Labour Committee and the Budget Committee by House Republican leader Kevin McCarthy.
Democrats contend that, because of her past remarks, she had “forfeited her right” to join these panels, particularly the education committee.
Congresswoman Debbie Wasserman Schultz, a Florida Democrat who is leading the resolutions, said: “If Republicans won’t police their own, the House must step in.”
The resolution was co-sponsored by two other Democrats: Ted Deutch of Florida and Jahana Hayes of Connecticut.
