In 2015, he decamped to the
People's Democratic Party where he was re-elected as a member of the
House of Representatives representing Kabba/Ijumu federal constituency. In the 2015
Senatorial election he was elected a member of the
Senate of Nigeria from the Kogi-West. He seconded the nomination of Senator
Bukola Saraki as candidate for the office of
President of the Senate following a nomination made by Senator
Ahmad Sani Yerima. He was re-elected on 23 February 2019 to return as senator representing kogi-West senatorial district to be a member of the 9th Senate. His main challenger in the election, Sen
Adeyemi of the APC approached Election Petitions Tribunal asking the tribunal to annul the election of Melaye. On 23 August 2019 the tribunal sacked Melaye and ordered a re-run election. After several confrontations with the Federal Government and his State Government, Senator Dino Melaye lost his Appeal to retain his senatorial seat on 11 October 2019 and a re-run election was immediately ordered to be conducted by the
Independent National Electoral Commission (INEC). INEC however moved for the election to be conducted on a later date from the State governorship election slated for 16 November 2019; however, Senator Dino Melaye moved and petitioned INEC for his rerun election to be conducted on same day as the state governorship election. Reacting to a claim from Senator Dino that the state Governor,
Yahaya Bello, is perfecting plans to rig the election in favor of his favorite candidate, Senator Smart Adeyemi. Senator Dino Melaye with a margin of over 20,000 votes, lost to his political rival, Smart Adeyemi in an election that was later declared inconclusive by INEC due to violence and electoral irregularities in over 50 Polling Units in the senatorial district. A make-up Election was however fixed for 30 November 2019, after which it was alleged that Senator Dino Melaye was planning to boycott the election, but was however seen casting his vote on the election day. The supplementary election suffered a low turn out of electorates; this could be due to the high level of harassment, killings, and intimidation faced during the main election. Senator Smart Adeyemi was able to defeat Senator Dino Melaye still maintaining almost the same margin as the general election. The results of the election was however believed to have been tampered with by the State Government in favor of Smart Adeyemi. Smart Adeyemi has since been sworn in as a replacement for Senator Dino Melaye by the Senate President.
Governorship ambition Dino Melaye contested for the Kogi State gubernatorial election which was held on 16 November 2019. On 3 September 2019, He lost his gubernatorial ambition in a keenly contested primary election where he came third, with a total of 70 votes behind Engr. Musa Wada who won with 748 votes. He has been declared the winner of the 2023 Peoples Democratic Party (PDP) governorship primary election in Kogi state, to be deputized by Hon. Habeebat Deen. He lost the 2023 Kogi State Governorship Election as he came third with 46,362 votes and
Ahmed Usman Ododo who emerged winner from the All progress Congress (APC) and
Muritala Ajaka from the Social Democratic Party (SDP) coming second with 259,052 votes.
Bills and motions sponsored Dino Melaye sponsored about 20 bills and moved over 30 motions in the 8th national assembly. One of such bills is "A Bill for an Act to provide for the Establishment of a Federal University of Agriculture, Kabba. During his tenure his government provisions for its due management, administration and other related matters, 2017 (S.B. 402)." Other bills were passed by his government which was sponsored by him which include: "A Bill for the prohibition of persons from lynching, mob action and extrajudicial executions", It seeks to protect crime suspects from extrajudicial and
summary executions by offering statutory protection. The disability integration bill, protection against domestic violence act are other bills sponsored by Sen. Melaye. He sponsored the bill to checkmate the discrepancies in subsidy Payments and non-remittance of Fund by the
NNPC to the Federation Account. 2017. Dino was said he regretted supporting
Buhari in the 2015 general election. == Political controversies and scandals ==