Opinion of Advocate General Campos Sánchez-Bordona delivered on 28 May 2020.#Republic of Poland v European Parliament and Council of the European Union.#Action for annulment – Directive (EU) 2018/957 – Freedom to provide services – Posting of workers – Terms and conditions of employment – Remuneration – Duration of posting – Determination of the legal basis – Articles 53 and 62 TFEU – Amendment of an existing directive – Article 9 TFEU – Principle of non-discrimination – Necessity – Principle of proportionality – Regulation (EC) No 593/2008 – Scope – Road transport – Article 58 TFEU.#Case C-626/18.