He lost the elections to Badal by 18,500 votes. In January 2019, Mann was appointed the convener of AAP Punjab for a second time. His political rivals had in past criticized him over alcohol use. Mann has denied these allegations. In 2019, during a party rally in Barnala, Mann announced that he had denounced alcohol and swore never to touch it again. In June 2021, MLA and deputy leader of the opposition in Punjab assembly, Saravjit Kaur Manuke held a hunger strike along with AAP activists to protest against the inaction of the Punjab government in the payment of post-matric scholarship amount of Dalit students. Mann said that the protest by AAP members had forced the Punjab government then led by CM Amarinder Singh to release the funds amounting to 200 crores as a 40% share of the amount that the Punjab government had to pay. Member of Parliament First term (2014–2019) In May 2014, he was elected to the 16th Lok Sabha from Sangrur Lok Sabha constituency after defeating Sukhdev Singh Dhindsa from Shiromani Akali Dal. He got 533,237 total votes and won election with a margin of 211,721 votes. Parliamentary Committee assignments 1 September 2014 – 25 May 2019: Member, Standing Committee on Personnel, Public Grievances, Law and Justice. Member of the Consultative Committee, Ministry of Rural Development, Panchayati Raj and Drinking Water and Sanitation 11 December 2014 – 25 May 2019 : Member, Joint Committee on Offices of Profit Second term (2019–2022) In May 2019, he was re-elected to 17th Lok Sabha from Sangrur constituency in the 2019 Indian general election. He won his second term in the Parliament with a margin of 110,211 votes. He got 413,561 votes while contesting against Kewal Singh Dhillon from Indian National Congress and Parminder Singh Dhindsa from Shiromani Akali Dal. He is only Member of parliament from Aam Aadmi Party in the lower house (Lok Sabha) of the parliament. On 18 January 2022, he was chosen as the Chief Minister of Punjab candidate from the Aam Aadmi Party for the 2022 Punjab Legislative Assembly election. The selection was reportedly done by polling from the public and the results were declared by the party chief Arvind Kejriwal. On 9 February, Mann raised issues about farmers in the Lok Sabha. The payment to sugarcane farmers for the year 2020-21 and 2021-22 had been pending. He appealed for clearing the due early along