TOKYO - Japanese Prime Minister Shinzo Abe is considering calling a snap election for as early as next month to take advantage of his improved approval ratings and disarray in the main opposition party, government and ruling party sources said on SundayOther possibilities are later in October or after an expected visit by US President Donald Trump in early NovemberE世博esball"Until now, it appeared the election would be next autumn, butAbe's ratings have recovered to 50 percent in some pollswe must always be ready for battle," domestic media quoted Komeito party chief Natsuo Yamaguchi as telling reporters on Saturday during a visit to RussiaE世博esballAbe told executives of his Liberal Democratic Party and its junior coalition partner, the Komeito party, that he might dissolve parliament's lower house for a snap poll after the legislature convenes for an extra session from Sept 28, the sources said