Mexico presidential front-runners hit back at Trump tweets

Ciudad Juárez (Mexico) (AFP) - Mexico's top presidential candidates lashed out Sunday at Donald Trump for saying the country was doing "very little" to stop illegal migration, and vowed to take a harder line with the US president."We are going to be very respectful toward the United States government, but we are also going to demand that (the United States) respect Mexicans," he told a cheering crowd as he kicked off his campaign in Ciudad Juarez, on the US border.