The Kentucky senator, who has clashed with Anthony S. Fauci and other health officials throughout the pandemic, is in line to lead a Senate committee should he win reelection and Republicans retake the chamber next week. (While Paul is heavily favored in his own race, control of the Senate is viewed as a toss-up by pollsters.) GOP control would give the libertarian doctor — an outspoken critic of the government’s coronavirus policies — the power to lead investigations and help set legislative priorities next year, either as chairman of the Senate’s sweeping health committee or its more targeted government oversight panel.