Lebanon’s Bahaa al-Hariri declared on Friday he was entering Lebanese politics, saying he would join a battle “to take back the country” and follow in the footsteps of his slain father days after his brother, Saad, stepped away from public life. In a recorded message, Bahaa, 55, said he would “continue the journey” of Rafik al-Hariri, who, with Saudi backing, established the Hariri family as the dominant player in Lebanon’s Sunni community before his assassination in 2005. “Through partnership and solidarity, we will enter the battle to take back the country and the sovereignty of the country …