The EU’s internal market chief Thierry Breton has urged X owner Elon Musk to comply with legal obligations under the EU’s digital rulebook hours before the billionaire is expected to interview US Republican candidate Donald Trump live on his platform. In the letter, published on X, Breton says that Musk has a “legal obligation” to ensure that “all proportionate and effective mitigation measures are put in place regarding the amplification of harmful content in connection with relevant events, including live streaming.” Failure to put such measures in place could “increase the risk profile of X…