On April 2, Elliott announced via Twitter her intention to seek the PC candidate nomination for the provincial riding of Newmarket-Aurora. The original PC candidate, Charity McGrath, was disqualified by the PC Party's provincial nomination committee (PNC) amid complaints that she'd signed up riding association members without their knowledge. On March 15, the PNC voted unanimously to bar McGrath from standing for the party in any riding for the 2018 election. Elliot won the election on June 7, 2018 and her party formed a majority government during the 42nd Parliament of Ontario. Premier Ford appointed Elliot appointed to be Deputy Premier and Ministry of Health and Long-Term Care in the Executive Council of Ontario.