FRANKFURT: A European Commission proposal to limit the European Central Bank’s power to supervise banks is “much too tight” and risks hampering ECB efforts to make the sector safer, Frankfurt’s top supervisor said on Tuesday. Speaking at the European Parliament, Daniele Nouy questioned part of the Commission’s package setting out rules for deciding how much Pillar 2 capital banks must hold to absorb losses — effectively the ECB’s most powerful tool as a supervisor. This was likely to rekindle a simmering conflict between the ECB’s Single Supervisory Mechanism, which has been trying to establish itself as a tough watchdog since 2014, and other policymakers in Frankfurt and Brussels, who worry about the risk of choking off bank lending and growth. “The proposed legislation on Pillar 2, while rightly seeking to further supervisory convergence, seeks to put a frame around supervisory actions that is much too tight in essential aspects,” said Nouy, who chairs the ECB’s supervisory board. Nouy argued supervisors should be allowed to demand that banks meet their Pillar 2 requirements using the most restrictive definition of capital, known as Core Equity Tier 1.