At the
2015 general election, Jones was elected to Parliament as MP for
Merthyr Tydfil and Rhymney with 53.9% of the vote and a majority of 11,513. He supported
Owen Smith in the failed attempt to replace
Jeremy Corbyn in the
2016 Labour leadership election. Having served as a
Parliamentary Private Secretary (PPS) to the Shadow Wales and Defence teams, he was appointed by Labour leader Jeremy Corbyn as a Shadow Wales Minister in October 2016 and a Shadow Defence Minister in July 2017. Jones was re-elected as MP for Merthyr Tydfil and Rhymney at the snap
2017 general election with an increased vote share of 66.8% and an increased majority of 16,334. He was again re-elected at the
2019 general election, with a decreased vote share of 52.4% and a decreased majority of 10,606. Due to the
2023 Periodic Review of Westminster constituencies, Jones' constituency of Merthyr Tydfil and Rhymney was abolished, and replaced with
Merthyr Tydfil and Upper Cynon. In June 2023, Jones defeated
Beth Winter to be selected as the Labour candidate for Merthyr Tydfil and Upper Cynon at the
2024 general election. The seat was ultimately renamed
Merthyr Tydfil and Aberdare in the final recommendations published late in the month. In the
2023 British shadow cabinet reshuffle, he was appointed Shadow Minister for Scotland. At the
2024 general election, Jones was elected to Parliament as MP for Merthyr Tydfil and Aberdare with 44.8% of the vote and a majority of 7,447. He was appointed an Assistant Government
Whip in July 2024, serving until his departure from Government in the
September 2025 reshuffle. ==Personal life==