The lower house is controlled by the president's National Regeneration Movement (MORENA), which holds just over half of the 500 seats. Recent polls project that, although MORENA could lose some seats, it is likely to retain control of the house with the help of two allied parties.
"The jump in Mexico's headline inflation ... was driven once again by higher fuel inflation. We think this trend has a bit further to run, but the central bank is likely to look through this and keep its policy rate at 4.00% over the coming months," said Nikhil Sanghani, Latin America economist at Capital Economics.
Consumer prices rose 0.83% in March, according to non-seasonally adjusted figures.