By Dave Graham MEXICO CITY (Reuters) – Mexico will send legislation to Congress this week to flesh out a reform that seeks to curb the power of telecoms mogul Carlos Slim and the countrys top broadcaster, Televisa, a senior lawmaker said on Wednesday. Slim and Televisa have dominated their industries in Mexico for years, and one aim of the shake-up is to cut their share of the market to below 50 percent. Emilio Gamboa, Senate leader of the governing Institutional Revolutionary Party, or PRI, said the so-called secondary laws to implement the governments overhaul of the phone and television markets will be presented this week. The last regular working day for Congress this week is Thursday, and a PRI official told Reuters that that was the day the secondary laws, which were originally supposed to be passed by December, were likely to be presented.