PARIS, June 20 (Reuters) - Two exit polls showed the centre-right Les Republicains came top in the first round of a regional election in the northern Hauts-de-France region on Sunday, beating Marine Le Pen"s far-right Rassemblement National into second place. President Emmanuel Macron"s ruling party failed to reach the 10% threshold to qualify for the second round, the exit polls showed. A win for Les Republicains lead candidate Xavier Bertrand would bolster his chances of becoming the conservative"s presidential candidate. read more OpinionWay/Cnews poll: Les Republicains: 39% Rassemblement National: 28% Macron"s LaRem: 9% Reporting by Michel Rose; editing by Richard Lough