Brazil's government is at loggerheads with its top coalition partner in Congress over a legislative logjam and the growing rift could delay reforms to drive growth and cut costs, a government ally said on Friday. Relations between the center-left government and the Brazilian Democratic Movement Party (PMDB), one of seven leading parties in the governing coalition, have been on a slide since President Luiz Inacio called off a cabinet reshuffle without giving Brazil's biggest party extra seats. PMDB leader Renan Calheiros on Friday warned a flood of temporary decrees from Lula -- emergency measures which must be voted on before other legislation -- could delay reforms like a tax overhaul unless Lula works more closely with allies. "Congress is paralyzed like never before, we've never had such an accumulation of this material," said Senate president Calheiros, setting an Apr. 28 deadline for Lula to clear away decrees. "We need to resume the growth agenda by getting back to reforms." Brazil's center-left government has suffered a series of legislative setbacks in the last two months amid tense relations with the governing coalition. --More 0043 Local Time 2143 GMT