Home Minister Rajnath Singh on Sunday congratulated BJP president Amit Shah on his re-election and said he was sure the party will reach "newer heights of success" under him."Heartiest congratulations to Amit Shah on his re-election as the BJP national president," the former Bharatiya Janata Party president tweeted."He has been an extremely successful party president," he said of Amit Shah, a confidant of Prime Minister Narendra Modi. "I am confident that the BJP will continue its forward march under Amit Shah's stewardship and reach to newer heights of success and glory," the home minister said.