Mr Santos, a 34-year-old New York Republican, has come under fierce criticism from both sides of the US political spectrum after admitting that large portions of his life story were lies - including non-existent university degrees, a made-up real estate portfolio and confusion over his religion and family history.
The growing scandal marred his first day on Capitol Hill.
Mr Santos's only respite from the posse of reporters waiting for him in the hallways was on the House floor, where he largely sat by himself. When he cast his vote to elect the House speaker, a Democratic lawmaker reportedly shouted the word "mentiroso" - the Spanish word for "liar".
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