Prime Minister Narendra Modi on Monday called on President Pranab Mukherjee at Rashtrapati Bhavan here."PM @narendramodi met President Pranab Mukherjee today. @RashtrapatiBhvn," PMO said in a tweet.The meeting came after the Union cabinet cleared four Goods and Services Tax-related bills.The passage of the four GST related bills in Parliament will pave the way for the biggest reform in indirect taxes in independent India.