House Republican leaders will try to remove Representative Steve King of Iowa from the powerful Judiciary Committee and his other panel assignments on Monday night as the party officials scrambled to appear tough on racism and contain damage from comments Mr. King made to The New York Times questioning why white supremacy is considered offensive.

Mr. King’s own party leadership moved against him throughout the day, with the Senate majority leader, Mitch McConnell, suggesting Mr. King find “another line of work” and Senator Mitt Romney saying he should quit. In an attempt to be proactive, the House Republicans stripped him of the coveted Judiciary and Agriculture Committee seats in the face of multiple Democratic resolutions to censure Mr. King that are being introduced this week.

Those measures will force Republicans to take a stand on whether to go along with the House Democratic majority’s attempt to publicly reprimand one of their own.