Lewis has practiced law for 20 years and is the managing partner of Lewis Law, a firm specializing in commercial litigation and international contract trade practice, which focuses on energy policy. Prior to starting her own firm she practiced litigation with larger Bay Street firms in the early 2000’s and then moved to briefly practice criminal law. Lewis has also been an Instructor at the Osgoode Hall Law School. Hosting her own television show called Law Matters, Lewis examined legal issues and crisis in the lives of everyday people. She interviewed one guest, Pastor Ted Haggard, at the height of the scandal in which he was accused of engaging in extra-marital relations with a man. She also interviewed a number of other guests, including Ben Johnson, the former Canadian gold medalist accused of steroid abuse. In 2018 she was appointed under Premier Doug Ford to the board of the Ontario Trillium Foundation and was later named to the foundation's committee responsible for dispensing funds for youth programs.
Lewis began her political career in the riding of Markham-Stouffville, where she was Vice President and a primary fundraiser of the riding under Paul Calandra. In 2015, Prime Minister Stephen Harper appointed her as a replacement candidate to run the riding of Scarborough-Rouge Park only a few weeks before the vote. The riding had been plagued with a scandal, for which the previous Conservative candidate had been dismissed. An article in the National Post referred to Lewis as a “high-quality substitute". She eventually placed second to Liberal Gary Anandasangaree, but managed to obtain over 13,000 votes – one of the highest vote counts among Conservatives in the GTA.
Conservative Party leadership candidate
In February 2020, Lewis was the first womanto be confirmed as an official leadership contestant for the Conservative Party of Canada, following the stepping down of former Leader Andrew Scheer in December 2019. She is running to be the first visible minority woman to lead any of the three major federal Canadian parties. Lewis' platform is socially conservative. She opposes the Canadian government's proposed ban on conversion therapy, citing the importance of parental autonomy and has stated she personally believes that marriage should be between a man and a woman, but would not roll back existing legislation allowing equal marriage in Canada. She has stated that she would like to make marijuana access more restrictive and that she thinks reactions to climate change are overblown. She has publicly described herself as "pro-life, no hidden agenda" and as leader would have the Conservative Party move to ban sex-selective abortion and coerced abortion, increase government funding for crisis pregnancy centres, and she would end foreign aid funding for abortion. Her candidacy has been endorsed by pro-life advocacy groups including the Campaign Life Coalition. She opposes carbon taxes and supports promoting green technology as an alternative policy.